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Study of vibrational spectra of lanthanum sulphate nonahydrate at different temperatures in the region from 4000–50 cm−1 非水合硫酸镧在4000 ~ 50 cm−1范围内不同温度下的振动谱研究
Infrared physics Pub Date : 1993-12-01 DOI: 10.1016/0020-0891(93)90117-P
M. Arora , M.M. Pradhan , M.C. Bansal
{"title":"Study of vibrational spectra of lanthanum sulphate nonahydrate at different temperatures in the region from 4000–50 cm−1","authors":"M. Arora ,&nbsp;M.M. Pradhan ,&nbsp;M.C. Bansal","doi":"10.1016/0020-0891(93)90117-P","DOIUrl":"10.1016/0020-0891(93)90117-P","url":null,"abstract":"<div><p>Infrared spectra of lanthanum sulphate nonahydrate are studied over the 4000–50 cm<sup>−1</sup> range. The bands pertaining to different internal and external modes of sulphate ion and water molecules are observed and assigned. It is shown that coordinated water molecules exist at two site symmetries C<sub>1</sub> and C<sub>i</sub>, which provides confirmation of crystallographic data. Lattice water is not found in these crystals. The effect of low temperature on librational modes of coordinated water and their lattice vibrations are studied in the 550–50 cm<sup>−1</sup> region. The potential force field constants are calculated for rocking, wagging and twisting librational modes of water at 290 K, 80 K and 60 K. The higher value of the potential constant for the rocking mode from the wagging librational mode shows the in-plane bend of the hydrogen bond in lanthanum sulphate crystals.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 6","pages":"Pages 595-600"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90117-P","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53082152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of the relationship between particle sizes of polymer powders and their radiative properties 聚合物粉末粒径与辐射性能关系的研究
Infrared physics Pub Date : 1993-12-01 DOI: 10.1016/0020-0891(93)90119-R
M. Papini
{"title":"Study of the relationship between particle sizes of polymer powders and their radiative properties","authors":"M. Papini","doi":"10.1016/0020-0891(93)90119-R","DOIUrl":"10.1016/0020-0891(93)90119-R","url":null,"abstract":"<div><p>The reflectance of a surface considered as smooth relative to the wavelength mainly consists of a specular component while for a rough surface, the reflectance is composed of both specular and diffuse (or volume) components, their relative importance depending on the nature of the reflecting material. The present samples consist of polypropylene powders and the influence of particle size on total and diffuse reflectance is discussed over two wavelength ranges: 0.25–2.5 and 2.5–15.5 μm. The results of this study indicate firstly, that in the first wavelength range, the areas of the absorbance peaks increase while they decrease for the other wavelength range with particle size and secondly, that the reflectance values calculated for the wavelength range 0.25–2.5 μm, with respect to a blackbody at 5800 K, vary with particle size.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 6","pages":"Pages 607-619"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90119-R","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53082176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Investigation of dielectric spaced resonant mesh filter designs for PMIRR PMIRR介质间隔谐振网格滤波器设计研究
Infrared physics Pub Date : 1993-12-01 DOI: 10.1016/0020-0891(93)90111-J
P.G.J. Irwin , P.A.R. Ade , S.B. Calcutt , F.W. Taylor , J.S. Seeley , R. Hunneman , L. Walton
{"title":"Investigation of dielectric spaced resonant mesh filter designs for PMIRR","authors":"P.G.J. Irwin ,&nbsp;P.A.R. Ade ,&nbsp;S.B. Calcutt ,&nbsp;F.W. Taylor ,&nbsp;J.S. Seeley ,&nbsp;R. Hunneman ,&nbsp;L. Walton","doi":"10.1016/0020-0891(93)90111-J","DOIUrl":"10.1016/0020-0891(93)90111-J","url":null,"abstract":"<div><p>The fabrication of the filters for the two longest wave channels of the Pressure Modulator Infra-red Radiometer (PMIRR), launched in September 1992 on Mars Observer, was not possible using conventional multilayer dielectric techniques. Thus the extension of far-infrared/microwave mesh filter designs was investigated using a new dielectric spacing material. Test filters were designed and fabricated and, using their measured transmission spectra, a new model of the behaviour of resonant meshes in both air and dielectrics was developed. The low transmission of these filters in the end made them unsuitable for PMIRR but the model provides a useful design tool for future dielectric spaced filters providing a new, less absorbing dielectric can be found.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 6","pages":"Pages 549-563"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90111-J","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53082064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Quantum based temperature standards 基于量子的温度标准
Infrared physics Pub Date : 1993-12-01 DOI: 10.1016/0020-0891(93)90114-M
H.A. Gebbie
{"title":"Quantum based temperature standards","authors":"H.A. Gebbie","doi":"10.1016/0020-0891(93)90114-M","DOIUrl":"10.1016/0020-0891(93)90114-M","url":null,"abstract":"<div><p>The value of basing the Kelvin temperature scale based on blackbody spectra is again emphasized. With the effectiveness of FTS now well established and some suggested refinements in data reduction, the way to implement this is now clear.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 6","pages":"Pages 575-577"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90114-M","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53082110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Stimulated recombination from the defect level in doped lead telluride 掺杂碲化铅缺陷水平的受激复合
Infrared physics Pub Date : 1993-12-01 DOI: 10.1016/0020-0891(93)90125-Q
S.D. Darchuk, F.F. Sizov, L.A. Korovina
{"title":"Stimulated recombination from the defect level in doped lead telluride","authors":"S.D. Darchuk,&nbsp;F.F. Sizov,&nbsp;L.A. Korovina","doi":"10.1016/0020-0891(93)90125-Q","DOIUrl":"10.1016/0020-0891(93)90125-Q","url":null,"abstract":"<div><p>The relaxation processes of the photoexcited carriers from the defect level in the band gap to the valence band states were investigated in Na and Tl doped p-type PbTe single crystals at <em>T</em> = 77 K. The observed photosignal oscillations were proved to be induced by stimulated recombination of photoexcited carriers from the defect level <em>E</em><sub>d</sub> ≈ 50 meV above the top of the valence band. Non-equilibrium carrier inversion population was produced by impulses of a TEA CO<sub>2</sub>-laser. The observed stimulated recombination may presumably be used for designing IR semiconductor lasers operating in the wavelength range of <em>λ</em> ∼ 25 <em>μ</em>m at <em>T</em> = 77 K.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 6","pages":"Pages 655-659"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90125-Q","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53082246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Stark spectroscopy of 13CD3OH with the HCN laser 13CD3OH的HCN激光Stark光谱
Infrared physics Pub Date : 1993-12-01 DOI: 10.1016/0020-0891(93)90126-R
G.R. Sudhakaran , M. Jackson , R.M. Lees , Li-Hong Xu , I. Mukhopadhyay
{"title":"Stark spectroscopy of 13CD3OH with the HCN laser","authors":"G.R. Sudhakaran ,&nbsp;M. Jackson ,&nbsp;R.M. Lees ,&nbsp;Li-Hong Xu ,&nbsp;I. Mukhopadhyay","doi":"10.1016/0020-0891(93)90126-R","DOIUrl":"10.1016/0020-0891(93)90126-R","url":null,"abstract":"<div><p>The laser Stark spectrum of <sup>13</sup>CD<sub>3</sub>OH has been studied using the 311 μm line of the HCN laser. An extensive series of absorption lines has been observed and assigned to the <em>J</em> = 3 to 11 members of the <em>K</em> = 2 ← 3E<sub>1</sub>, Q-branch transition in the <em>v</em><sub>t</sub> = 1 excited torsional state. Zero-field frequencies for all the assigned transitions are given with improved accuracy over those calculated from available molecular constants. For the Q-branch series, the branch origin and the series expansion coefficients are also presented.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 6","pages":"Pages 661-665"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90126-R","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53082259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Photoconductivity of a semiconductor with a transverse gradient of drift velocity of charge carriers 具有载流子漂移速度横向梯度的半导体的光电导率
Infrared physics Pub Date : 1993-12-01 DOI: 10.1016/0020-0891(93)90124-P
A. Medvid́, M. Ogrinsh
{"title":"Photoconductivity of a semiconductor with a transverse gradient of drift velocity of charge carriers","authors":"A. Medvid́,&nbsp;M. Ogrinsh","doi":"10.1016/0020-0891(93)90124-P","DOIUrl":"10.1016/0020-0891(93)90124-P","url":null,"abstract":"<div><p>The spectral photosensitivity of a semiconductor with a gradient of the drift velocity of charge carriers has been investigated. It was found to be of either selective or bolometric type depending on mutual directions of incident light and of the gradient. Photoconductivity of germanium samples of ringlike geometry was studied experimentally over the spectral range 0.8–2.2 μm at room temperature. The main results are: decay of the photocurrent in a semiconductor where the gradient differs from the exponential one and depends on the mutual directions of the gradient and diffusion of carriers; the amplitude of the photocurrent depends not only on the typical parameters but on light direction and also gradient; determination of both effective lifetime of carriers and the bandgap by the Moss method is not valid for a semiconductor with a gradient of drift velocity; a photodetector with parameters reversibly controlled by an electric field is possible.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 6","pages":"Pages 647-653"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90124-P","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53082236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical analysis of longwavelength extracted photodiodes 长波长提取式光电二极管的数值分析
Infrared physics Pub Date : 1993-12-01 DOI: 10.1016/0020-0891(93)90112-K
Józef Piotrowski, Alina Józwikowska, Krzysztof Józwikowski, Robert Ciupa
{"title":"Numerical analysis of longwavelength extracted photodiodes","authors":"Józef Piotrowski,&nbsp;Alina Józwikowska,&nbsp;Krzysztof Józwikowski,&nbsp;Robert Ciupa","doi":"10.1016/0020-0891(93)90112-K","DOIUrl":"10.1016/0020-0891(93)90112-K","url":null,"abstract":"<div><p>The electrical and photoelectrical properties of the longwavelength <em>n</em><sup>+</sup><em>πp</em><sup>+</sup> Hg<sub>1−<em>x</em></sub>Cd<sub><em>x</em></sub>Te structures have been analyzed numerically. The band diagram, electrical field, photoelectrical gain, responsivity, noise and detectivity have been calculated as a function of voltage applied. The calculations have been performed for devices prepared from Hg<sub>1−<em>x</em></sub>Cd<sub><em>x</em></sub>Te, optimized for optimum performance at <em>λ</em> = 10.6 <em>μm</em>, and operated at a temperature of 230 K. Reverse bias results in suppression of Auger generation current in the lightly doped region of the junction. The main contribution to the total noise current comes mostly from the heavily doped <em>p</em><sup>+</sup> region and then from regions close to l-h junctions.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 6","pages":"Pages 565-572"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90112-K","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53082072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 19
A simple approximative method for determination of Auger 1 lifetime in degenerate narrow gap semiconductors 简并窄间隙半导体中俄歇1寿命测定的简单近似方法
Infrared physics Pub Date : 1993-12-01 DOI: 10.1016/0020-0891(93)90118-Q
Z. Djurić, Z. Jakšić, A. Vujanić, M. Smiljanić
{"title":"A simple approximative method for determination of Auger 1 lifetime in degenerate narrow gap semiconductors","authors":"Z. Djurić,&nbsp;Z. Jakšić,&nbsp;A. Vujanić,&nbsp;M. Smiljanić","doi":"10.1016/0020-0891(93)90118-Q","DOIUrl":"10.1016/0020-0891(93)90118-Q","url":null,"abstract":"<div><p>Using the well-known Beattie-Landsberg expression for Auger 1 lifetime and the “effective” Auger energy gap (<em>E</em><sub><em>gA</em></sub>), we obtained a simple approximative expression for determination of the Auger 1 lifetime. We also obtained a formula for the electron concentration above which the effects of degeneration are significant.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 6","pages":"Pages 601-605"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90118-Q","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53082164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Temporal intracavity detection of parasitic infrared absorption in Ti:Sapphire lasers Ti:蓝宝石激光器寄生红外吸收的时间腔内检测
Infrared physics Pub Date : 1993-12-01 DOI: 10.1016/0020-0891(93)90123-O
A.D. Deleva , Z.Y. Peshev , Z.I. Aneva
{"title":"Temporal intracavity detection of parasitic infrared absorption in Ti:Sapphire lasers","authors":"A.D. Deleva ,&nbsp;Z.Y. Peshev ,&nbsp;Z.I. Aneva","doi":"10.1016/0020-0891(93)90123-O","DOIUrl":"10.1016/0020-0891(93)90123-O","url":null,"abstract":"<div><p>An intracavity technique with temporal sensitivity to optical losses is used to detect parasitic infrared absorption (PIRA) in Ti:sapphire crystals with high active-center concentrations. By means of comparative analysis, re-emission is established of part of the parasitically absorbed energy back into the laser action channel. A method is proposed for approximate quantitative determination of the relative part of re-emitting PIRA-centers with respect to their total number; for the highly-doped crystal described, it is estimated at about 11%.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"34 6","pages":"Pages 641-645"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(93)90123-O","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53082226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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