Journal of Molecular Spectroscopy最新文献

{"title":"Measurements of perfluoro-n-hexane and perfluoro-2-methylpentane infrared absorption cross-sections from 298 to 350 K","authors":"Muhammad Osama Ishtiak ,&nbsp;Orfeo Colebatch ,&nbsp;Karine Le Bris ,&nbsp;Paul J. Godin ,&nbsp;Kimberly Strong","doi":"10.1016/j.jms.2023.111835","DOIUrl":"https://doi.org/10.1016/j.jms.2023.111835","url":null,"abstract":"<div><p>Perfluoro-n-hexane and perfluoro-2-methylpentane are fully fluorinated alkanes used as non-ozone-depleting alternatives to chlorofluorocarbons and hydrochlorofluorocarbons. These compounds are long-lived and potent greenhouse gases due to their strong C<img>F bonds and infrared absorption in the atmospheric window. Infrared absorption cross-sections are required to quantify the climate impact of these compounds via the radiative efficiency and global warming potential. To our knowledge, there are only two experimental measurements for perfluoro-n-hexane, and there are no experimental measurements for perfluoro-2-methylpentane in the infrared. In this work, we provide a set of absorption cross-sections in the range 515–1500 cm⁻¹, at 0.1 cm⁻¹ resolution from 298 to 350 K for each compound. We calculate the absorption cross-section between 0 and 515 cm⁻¹ using density functional theory with various basis sets. The 6-31,G(d,p) basis set with the B3LYP functional is found to provide the best results. Using both measurements and calculations combined, we calculate the radiative efficiency and global warming potential for each compound. No significant temperature dependence was observed in these quantities. The average radiative efficiency derived from all cross-sections is 0.48 ± 0.06 W m⁻² ppbv⁻¹ for perfluoro-n-hexane and 0.46 ± 0.06 W m⁻² ppbv⁻¹ for perfluoro-2-methylpentane. The average 100-year global warming potential derived from all cross-sections is 9590 ± 1260 for perfluoro-n-hexane and 9220 ± 1210 for perfluoro-2-methylpentane.</p></div>","PeriodicalId":16367,"journal":{"name":"Journal of Molecular Spectroscopy","volume":"397 ","pages":"Article 111835"},"PeriodicalIF":1.4,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49748075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Conformational landscapes of symmetrically fluorine-substituted benzoic acids II: Calculations and measurements for the rotational spectrum and structure of 3,4,5-trifluorobenzoic acid","authors":"Jingling Hong ,&nbsp;Alitza Gracia ,&nbsp;Savannah Romero ,&nbsp;Mingfei Zhou ,&nbsp;Wei Lin ,&nbsp;Weixing Li","doi":"10.1016/j.jms.2023.111837","DOIUrl":"https://doi.org/10.1016/j.jms.2023.111837","url":null,"abstract":"<div><p>Calculations on the structure of 3,4,5-trifluorobenzoic acid were made using the Gaussian 16 program. The potential energy surfaces were scanned along C<img>C<img>C<img>O and O<img>C<img>O<img>H dihedral angles at the B3LYP/6-311G level to analyze its conformational landscape. Two conformations were identified and reoptimized at the B3LYP/aug-cc-pVTZ level. The result indicates that 3,4,5-trifluorobenzoic acid prefers a planar structure in its global minimum conformation. The pure rotational spectra of 3,4,5-trifluorobenzoic acid were measured in the frequency range of 6 – 12.5 GHz using a chirped pulse Fourier transform microwave (CP-FTMW) spectrometer. The spectra of the parent, seven ¹³C, and one deuterium singly substituted isotopologues were analyzed and fitted to measurement accuracy for a semi-rigid asymmetric top molecule. The rotational constants and centrifugal distortion constants were accurately determined. The rotational constants for the parent isotopologue are <em>A</em> = 1535.31408(32) MHz, <em>B</em> = 650.31751(16) MHz, and <em>C</em> = 456.98499(12) MHz. The effective structure of its ground vibrational state was determined from the spectra of the mono-substituted isotopologues. The agreement between the calculated and experimental spectroscopic constants is excellent.</p></div>","PeriodicalId":16367,"journal":{"name":"Journal of Molecular Spectroscopy","volume":"397 ","pages":"Article 111837"},"PeriodicalIF":1.4,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49758625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Conformational analysis of carboxylic acid anhydrides: A microwave and computational study","authors":"Nathan Love ,&nbsp;Aaron J. Reynolds ,&nbsp;Michael A. Dvorak ,&nbsp;Kenneth R. Leopold","doi":"10.1016/j.jms.2023.111844","DOIUrl":"https://doi.org/10.1016/j.jms.2023.111844","url":null,"abstract":"<div><p>The microwave spectra of four carboxylic acid anhydrides, RCOOCOR′, (R,R′) = (CH₃,<!--> <!-->CF₃), (C(CH₃)₃,<!--> <!-->CF₃), (C₆H₅, CF₃) and (CH₃, C(CH₃)₃), have been observed in a supersonic jet. Calculations at the M06-2X/6-311++G(d,p) and MP2/6-311++G(d,p) levels of theory predict the lowest energy conformations for all four species to be nonplanar <em>cis</em> structures, i.e., conformations in which the C=O groups point in approximately the same direction, but are twisted out of a coplanar orientation. The observed spectra are consistent with these predictions. In addition, for all but the (R,R′) = (CH₃, C(CH₃)₃) species, higher energy nonplanar <em>trans</em> conformers are also predicted, typically within 1–2 kcal/mole the nonplanar <em>cis</em> form. For (R,<!--> <!-->R′)<!--> <!-->= (C(CH₃)₃, CF₃), extensive isotopic substitution has enabled a determination of most of the (non-fluorine) heavy atom structural parameters. Excellent agreement with the DFT and MP2 structures was obtained, thus validating the theoretical methods used. A strong correlation is found between the calculated O=C⋯C=O dihedral angle and the average of the vapor phase C=O stretching frequencies of RCOOH and R′COOH.</p></div>","PeriodicalId":16367,"journal":{"name":"Journal of Molecular Spectroscopy","volume":"397 ","pages":"Article 111844"},"PeriodicalIF":1.4,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49748845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"H2O-HF dimer rotational spectra: New measurements and re-analysis","authors":"German Yu. Golubiatnikov ,&nbsp;Oleg L. Polyansky ,&nbsp;Nikolai F. Zobov ,&nbsp;Jonathan Tennyson ,&nbsp;Roman I. Ovsyannikov ,&nbsp;Mikhail Yu. Tretyakov","doi":"10.1016/j.jms.2023.111836","DOIUrl":"https://doi.org/10.1016/j.jms.2023.111836","url":null,"abstract":"<div><p>New measurements of the H<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span><span>O-HF dimer high resolution absorption spectrum are performed using a relatively warm (240–260 K) equilibrium gas mixture with two complementary spectrometers: a video spectrometer and spectrometer with radio-acoustic detection. Positions of over hundred H</span><span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span><span>O-HF lines in the 158–345 GHz range are refined (their uncertainty is reduced by about order of magnitude) and several tens of lines are newly measured. These data are re-fitted together with previous measurements giving a refined set of constants of effective Hamiltonian which characterizes the dimer intermolecular dynamics. The new data improves significantly (from 100 to about 10 kHz) the accuracy of rotational constants corresponding to separate series of lines with fixed </span><span><math><msub><mrow><mi>K</mi></mrow><mrow><mi>a</mi></mrow></msub></math></span>.</p></div>","PeriodicalId":16367,"journal":{"name":"Journal of Molecular Spectroscopy","volume":"397 ","pages":"Article 111836"},"PeriodicalIF":1.4,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49748719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effective Hamiltonians for calculation of rotational energy levels and relative intensities in open-shell clusters containing O2 (3Σg-) and a closed–shell molecule","authors":"Wafaa M. Fawzy","doi":"10.1016/j.jms.2023.111822","DOIUrl":"https://doi.org/10.1016/j.jms.2023.111822","url":null,"abstract":"<div><p>We introduce two effective Hamiltonians that are suitable for analysis and fitting IR and MW high resolution spectra in non-planar or planar O₂-closed-shell complexes, where the closed-shell moiety is a diatom or a triatomic molecule of any symmetry. These new Hamiltonians differ in our choice for the direction of quantization of the projection of the electron-spin angular momentum. For both electron-spin coupling schemes, the total rotation-spin-tunneling Hamiltonians include tunneling, electron-spin–spin coupling, electron-spin-rotation interaction, and centrifugal distortion forces. In addition, we introduce the appropriate molecular symmetry treatment for an O₂ (<span><math><mrow><msup><mrow><mspace></mspace></mrow><mn>3</mn></msup><msubsup><mi>Σ</mi><mi>g</mi><mo>-</mo></msubsup></mrow></math></span>)-XY₂ (e.g., O₂-SO₂ and O₂-H₂O) dimer in which the monomers exhibit permeation-inversion tunneling motion. Non-vanishing matrix elements of the total Hamiltonians and expectation values of six quantum numbers are evaluated in the appropriate basis set <span><math><mfenced><mrow><mrow><mi>S</mi><mo>,</mo><msub><mi>P</mi><mi>s</mi></msub><mo>;</mo><mi>P</mi><mo>,</mo><mi>J</mi><mo>,</mo><msub><mi>M</mi><mi>J</mi></msub></mrow></mrow></mfenced></math></span>. Diagonalization of the total Hamiltonian matrix provides the energy levels while the eigenfunctions are used to transform expectation values of the quantum numbers into the eigenfunctions basis and for calculation of relative intensities of the allowed transitions. The reported Hamiltonians were successfully applied for fitting the observed IR and FTMW spectra of the O₂-DF and O₂-SO₂ complexes, respectively.</p></div>","PeriodicalId":16367,"journal":{"name":"Journal of Molecular Spectroscopy","volume":"397 ","pages":"Article 111822"},"PeriodicalIF":1.4,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49764991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The first observation of the 12C16O2 absorption bands near 660 nm","authors":"Yu.G. Borkov,&nbsp;A.M. Solodov,&nbsp;A.A. Solodov,&nbsp;T.M. Petrova,&nbsp;V.I. Perevalov","doi":"10.1016/j.jms.2023.111843","DOIUrl":"https://doi.org/10.1016/j.jms.2023.111843","url":null,"abstract":"<div><p>The absorption spectra of carbon dioxide were recorded in the region from 15,000 to 15,300 cm⁻¹, using a Bruker IFS 125 HR Fourier transform spectrometer and a 30 m multipass cell with the White type optical system. The recording was performed at a spectral resolution of 0.044 – 0.050 cm⁻¹, room temperature, a path length of 1057.95 m and pressures of 185 and 362 mbar. Utilization of a LED as a light source provided a sensitivity (noise equivalent absorption) at the level of <em>k</em>_ν = 1.23 × 10^-10 cm⁻¹ and allowed detection of a number of lines of two 3005<em>i</em> − 00001 (<em>i</em> = 2,3) bands and several lines of the 60031 – 00001 band of ¹²C¹⁶O₂ with the intensity values down to 10^-30 cm⁻¹/(molecule cm⁻²) at 296 K. These bands were observed for the first time. The uncertainty of the line position measurements was estimated to be about 0.005 cm⁻¹ for the unblended lines with a high signal-to-noise ratio. The uncertainties of the retrieved line intensities for the strongest unblended lines are at the level of 15 %. The spectroscopic constants for observed bands were fitted to the observed line positions. The vibrational transition dipole moments squared of these bands were fitted to the observed line intensities. The measured line positions were compared to those from the HITRAN2020 database and to those predicted with the global effective Hamiltonian. The measured line intensities were compared to the values from the HITRAN2020 database and from the Ames2021 line list.</p></div>","PeriodicalId":16367,"journal":{"name":"Journal of Molecular Spectroscopy","volume":"397 ","pages":"Article 111843"},"PeriodicalIF":1.4,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49748529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effective Hamiltonians for calculation of rotational energy levels and relative intensities in open-shell clusters containing O2 (3","authors":"W. M. Fawzy","doi":"10.1016/j.jms.2023.111822","DOIUrl":"https://doi.org/10.1016/j.jms.2023.111822","url":null,"abstract":"","PeriodicalId":16367,"journal":{"name":"Journal of Molecular Spectroscopy","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41347460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The pressure effect on the line profiles observed in the ν1","authors":"S. Okubo, K. Iwakuni, Hideki Kato, F. Hong, H. Sasada, H. Inaba, K.M.T. Yamada","doi":"10.1016/j.jms.2023.111823","DOIUrl":"https://doi.org/10.1016/j.jms.2023.111823","url":null,"abstract":"","PeriodicalId":16367,"journal":{"name":"Journal of Molecular Spectroscopy","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45540199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The pressure effect on the line profiles observed in the ν1+ν3 band of acetylene: Revisited","authors":"Sho Okubo ,&nbsp;Kana Iwakuni ,&nbsp;Hideki Kato ,&nbsp;Feng-Lei Hong ,&nbsp;Hiroyuki Sasada ,&nbsp;Hajime Inaba ,&nbsp;Koichi M.T. Yamada","doi":"10.1016/j.jms.2023.111823","DOIUrl":"https://doi.org/10.1016/j.jms.2023.111823","url":null,"abstract":"<div><p>In our previous paper [K. Iwakuni et al., <em>Phys. Rev. Lett.</em> <strong>117</strong>, 1439026 (2018)] the ortho-para dependence of the pressure effects was reported for the <span><math><mrow><msub><mrow><mi>ν</mi></mrow><mrow><mn>1</mn></mrow></msub><mo>+</mo><msub><mrow><mi>ν</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span> band of acetylene measured by dual-comb spectroscopy. Sears and coworkers [E.C. Gross et al., <em>J. Chem. Phys.</em> <strong>154</strong>, 054305 (2021)] reevaluated the profile parameters for some lines of this band by comb-referenced laser spectroscopy, and pointed out that the ortho-para phenomenon must be a consequence of the use of Voigt function as the profile function, with the Doppler widths fixed at their theoretical values. Thus, we have remeasured this band with two improved spectrometers, the comb-locked laser spectrometer of the National Metrology Institute of Japan and another dual-comb spectrometer of Yokohama National University, and analyzed the lines by using the speed-dependent Voigt function as the profile function with several options. By the present work, we confirm the fact pointed out by Sears and coworkers, and present some remaining problems in the experimental determination of the line profile parameters.</p></div>","PeriodicalId":16367,"journal":{"name":"Journal of Molecular Spectroscopy","volume":"396 ","pages":"Article 111823"},"PeriodicalIF":1.4,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49750509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fourier transform infrared (FTIR) spectroscopy of formaldoxime isotopologue 12CD2NOH in the 300–3700 cm−1 region and its ν12 and ν9 bands: Vibrational and rovibrational analyses","authors":"A. Jusuf,&nbsp;T.L. Tan,&nbsp;Q.Y. Wu","doi":"10.1016/j.jms.2023.111812","DOIUrl":"https://doi.org/10.1016/j.jms.2023.111812","url":null,"abstract":"<div><p>The Fourier transform infrared (FTIR) spectrum of the formaldoxime isotopologue ¹²CD₂NOH was recorded in the 500–3700 cm⁻¹ region with a resolution of 0.50 cm⁻¹ to identify its fundamental, overtone and combination bands and to measure their relative infrared (IR) band intensities. Furthermore, the high-resolution (0.00096 cm⁻¹) FTIR spectrum of <span><math><mrow><msub><mi>ν</mi><mn>12</mn></msub></mrow></math></span> and <span><math><mrow><msub><mi>ν</mi><mn>9</mn></msub></mrow></math></span> bands of ¹²CD₂<span>NOH was recorded in Australian Synchrotron in the 300–510 cm</span>⁻¹ region for a rovibrational analysis. A total of 1060 IR transitions of the <em>C</em>-type <span><math><mrow><msub><mi>ν</mi><mn>12</mn></msub></mrow></math></span> band were fitted using the Watson's <em>A</em>-reduced Hamiltonian in the <em>I^r</em> representation with a root-mean-square (rms) deviation of 0.000524 cm⁻¹. From the rovibrational analysis, the <span><math><mrow><msub><mi>v</mi><mn>12</mn></msub></mrow></math></span><span> = 1 state rovibrational constants up to all 5 quartic centrifugal distortion terms were derived for the first time. The band center of the </span><span><math><mrow><msub><mi>ν</mi><mn>12</mn></msub></mrow></math></span> band of ¹²CD₂NOH was found to be 391.214740(46) cm⁻¹. The ground state rovibrational constants up to all 5 quartic terms were determined for the first time by the fitting of 423 ground state combination differences (GSCDs) derived from the IR transitions of the <span><math><mrow><msub><mi>ν</mi><mn>12</mn></msub></mrow></math></span> band of ¹²CD₂NOH of this work. The rms deviation of the GSCD fit was 0.000473 cm⁻¹ using the Watson’s <em>A-</em>reduced Hamiltonian in the <em>I^r</em> representation. Furthermore, a total of 724 IR transitions of the predominantly <em>B</em>-type <span><math><mrow><msub><mi>ν</mi><mn>9</mn></msub></mrow></math></span> band of ¹²CD₂NOH were fitted with a rms deviation of 0.000360 cm⁻¹ to derive the band center at 465.151277(39) cm⁻¹ and rovibrational constants of the <span><math><mrow><msub><mi>v</mi><mn>9</mn></msub></mrow></math></span><span> = 1 state up to 4 quartic terms for the first time. Additionally, all 3 rotational constants and 5 quartic centrifugal distortion terms of the ground state and 3 rotational constants of the </span><span><math><mrow><msub><mi>v</mi><mn>12</mn></msub></mrow></math></span> = 1 and <span><math><mrow><msub><mi>v</mi><mn>9</mn></msub></mrow></math></span> = 1 states of ¹²CD₂<span>NOH were computed from theoretical anharmonic calculations at 2 different levels of theory, B3LYP and MP2 with the cc-pVTZ basis set, for comparison with the experimental results. Close agreement was found for the calculated ","PeriodicalId":16367,"journal":{"name":"Journal of Molecular Spectroscopy","volume":"396 ","pages":"Article 111812"},"PeriodicalIF":1.4,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49699463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}