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Phonon dispersion and dielectric behaviour of mixed alkali halide crystal NaCl0.5Br0.5 混合碱卤化物晶体NaCl0.5Br0.5的声子色散和介电行为
Infrared physics Pub Date : 1992-11-01 DOI: 10.1016/0020-0891(92)90075-5
Sunil Asthana , R.P. Goyal , S.C. Goyal
{"title":"Phonon dispersion and dielectric behaviour of mixed alkali halide crystal NaCl0.5Br0.5","authors":"Sunil Asthana ,&nbsp;R.P. Goyal ,&nbsp;S.C. Goyal","doi":"10.1016/0020-0891(92)90075-5","DOIUrl":"10.1016/0020-0891(92)90075-5","url":null,"abstract":"<div><p>In the present paper we have calculated the phonon dispersion curves and dielectric constants, their volume derivatives and the Gruneisen parameters of the mixed alkali halide NaCl<sub>0.5</sub>Br<sub>0.5</sub>, using the extended three body force shell model. The results of dielectric constants, their volume derivatives and Gruneisen parameters are found to agree reasonably well with the experimental values, which establishes the validity of the three body charge transfer parameter. With this concept the phonon dispersion curves are obtained in all the three symmetry directions <em>(q,o,o), (q,q,o)</em> and <em>(q,q,q)</em>, which will be of interest for experimental workers, since no experimental values have so far been obtained for phonon frequencies.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"33 6","pages":"Pages 581-582"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(92)90075-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53081176","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
Sensitivity of the phonon in YBCO to superconductivity by infrared studies on epitaxial film 外延膜红外研究YBCO中声子对超导性的敏感性
Infrared physics Pub Date : 1992-11-01 DOI: 10.1016/0020-0891(92)90060-7
Wen-Sheng Zeng , Zeng-Fa Li , Guang-Yin Zhang , Shao-Lin Yan , Guang-Cheng Xiong , Shou-Zheng Wang
{"title":"Sensitivity of the phonon in YBCO to superconductivity by infrared studies on epitaxial film","authors":"Wen-Sheng Zeng ,&nbsp;Zeng-Fa Li ,&nbsp;Guang-Yin Zhang ,&nbsp;Shao-Lin Yan ,&nbsp;Guang-Cheng Xiong ,&nbsp;Shou-Zheng Wang","doi":"10.1016/0020-0891(92)90060-7","DOIUrl":"10.1016/0020-0891(92)90060-7","url":null,"abstract":"<div><p>Epitaxial films of YBCO superconductors whose <em>C</em> axes are primarily perpendicular to the film surface, were prepared. The samples, which were treated by means of a gettered annealing technique, were investigated by the X-ray diffraction pattern method (XRD) and infrared (IR) reflectance spectra in the 140–800 cm<sup>−1</sup> spectral range. The strengths of the phonon structures are influenced greatly by the superconductivity of the sample, which can be determined by the annealing conditions. The relation between the resulting IR activity of phonons and the superconductivity is clear and the important role of phonons in superconductivity is demonstrated.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"33 6","pages":"Pages 459-462"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(92)90060-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53080969","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
The mechanism of type II pyroelectric detectors II型热释电探测器的机理
Infrared physics Pub Date : 1992-11-01 DOI: 10.1016/0020-0891(92)90063-Y
Xu-Sheng Wang, Jian-Qi Zhang
{"title":"The mechanism of type II pyroelectric detectors","authors":"Xu-Sheng Wang,&nbsp;Jian-Qi Zhang","doi":"10.1016/0020-0891(92)90063-Y","DOIUrl":"10.1016/0020-0891(92)90063-Y","url":null,"abstract":"<div><p>A theoretical model of type II pyroelectric detectors, which considers primary, secondary and tertiary effects, is given. The responsivities vs the target width and frequency are derived and calculated for LiTaO<sub>3</sub> type II pyroelectric detectors. The results are in agreement with those of other experiments.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"33 6","pages":"Pages 481-486"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(92)90063-Y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53081016","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: 3
Infrared multiphoton dissociation in focused laser beams: II. Application to T/D/H isotope separation 聚焦激光束中的红外多光子解离:II。应用于T/D/H同位素分离
Infrared physics Pub Date : 1992-11-01 DOI: 10.1016/0020-0891(92)90066-3
S.K. Sarkar, A.K. Nayak, V. Parthasarathy, K.V.S. RamaRao, J.P. Mittal
{"title":"Infrared multiphoton dissociation in focused laser beams: II. Application to T/D/H isotope separation","authors":"S.K. Sarkar,&nbsp;A.K. Nayak,&nbsp;V. Parthasarathy,&nbsp;K.V.S. RamaRao,&nbsp;J.P. Mittal","doi":"10.1016/0020-0891(92)90066-3","DOIUrl":"10.1016/0020-0891(92)90066-3","url":null,"abstract":"<div><p>In the preceding paper it was shown that multiphoton dissociation (MPD) yield vs fluence can be expressed by a “power-law” model. Here the model is exploited for the purpose of presenting and analysing our experimental data on T/D/H separation. This approach permits a unified description of the experimental system regardless of the potential complexities.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"33 6","pages":"Pages 505-510"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(92)90066-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53081056","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: 5
Forthcoming conferences 即将到来的会议
Infrared physics Pub Date : 1992-11-01 DOI: 10.1016/0020-0891(92)90079-9
{"title":"Forthcoming conferences","authors":"","doi":"10.1016/0020-0891(92)90079-9","DOIUrl":"https://doi.org/10.1016/0020-0891(92)90079-9","url":null,"abstract":"","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"33 6","pages":"Page 594"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(92)90079-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137348569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermal pump saturation in CW optically pumped far infrared lasers 连续波光抽运远红外激光器的热泵饱和
Infrared physics Pub Date : 1992-11-01 DOI: 10.1016/0020-0891(92)90068-5
A. Harth
{"title":"Thermal pump saturation in CW optically pumped far infrared lasers","authors":"A. Harth","doi":"10.1016/0020-0891(92)90068-5","DOIUrl":"10.1016/0020-0891(92)90068-5","url":null,"abstract":"<div><p>Vibrational-translationally relaxing far infrared (FIR) laser gases are heated by relaxation from the first vibrational state containing the lasing levels to the ground state. This reduces the molecule density, thus leading to a lower effective pump absorption compared with a cold gas. This phenomenon is investigated theoretically by solving the appropriate heat diffusion equation, considering both the traditional circular symmetric waveguide structure and the sandwich (or parallel slab) structure. The most important results are discussed and compared with previously reported experiments. A method is given for an estimation of the effective pump absorption and the excess temperature.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"33 6","pages":"Pages 523-529"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(92)90068-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53081087","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: 5
Acoustic mode vibrational anharmonicity of hexahelometallate crystals 六金属酸盐晶体的声模振动非调和性
Infrared physics Pub Date : 1992-11-01 DOI: 10.1016/0020-0891(92)90077-7
Sanjeev Kumar Jain , R.P. Goyal , B.R.K. Gupta
{"title":"Acoustic mode vibrational anharmonicity of hexahelometallate crystals","authors":"Sanjeev Kumar Jain ,&nbsp;R.P. Goyal ,&nbsp;B.R.K. Gupta","doi":"10.1016/0020-0891(92)90077-7","DOIUrl":"10.1016/0020-0891(92)90077-7","url":null,"abstract":"<div><p>The vibrational anharmonicity and Grüneisen parameters of hexahelometallate A<sub>2</sub>MX<sub>6</sub> single crystals have been determined theoretically by making use of phonon lattice theory. The potential model employed to calculate these properties consists of long range coulomb, three body interactions, short range overlap repulsion effective upto the nearest neighbour ions and phonon-lattice interactions. These antifluorite structure compounds contain large MX<sup>2−</sup><sub>6</sub>- ions and as the interionic spacings are much greater than those of the alkaline-earth fluorite structure halides, their elastic constants are correspondingly smaller. The hydrostatic pressure derivatives of the second order elastic constants (SOEC) calculated for K<sub>2</sub>SnCl<sub>6</sub>, K<sub>2</sub>ReCl<sub>6</sub>, (NH<sub>4</sub>)<sub>2</sub>SnCl<sub>6</sub>, (NH<sub>4</sub>)<sub>2</sub>TeCl<sub>6</sub>, (NH<sub>4</sub>)<sub>2</sub>SnBr<sub>6</sub>, and (NH<sub>4</sub>)<sub>2</sub>TeBr<sub>6</sub>, are found to be positive and close to the experimental values. The vibrational anharmonicities of the long-wavelength modes are explained in terms of the acoustic mode Grüneisen parameters.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"33 6","pages":"Pages 589-592"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(92)90077-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53081207","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
Infrared synthesis of SO3 by homogeneous gas-phase CO2 laser-driven reactions 均相气相CO2激光驱动反应红外合成SO3
Infrared physics Pub Date : 1992-11-01 DOI: 10.1016/0020-0891(92)90072-2
I. Voicu , R. Alexandrescu , I. Morjan , M. Stoica , I. Ursu , V. Jianu
{"title":"Infrared synthesis of SO3 by homogeneous gas-phase CO2 laser-driven reactions","authors":"I. Voicu ,&nbsp;R. Alexandrescu ,&nbsp;I. Morjan ,&nbsp;M. Stoica ,&nbsp;I. Ursu ,&nbsp;V. Jianu","doi":"10.1016/0020-0891(92)90072-2","DOIUrl":"10.1016/0020-0891(92)90072-2","url":null,"abstract":"<div><p>By using a CO<sub>2</sub> laser operated at 10.6μm, a bimolecular reaction was induced in a binary SO<sub>2</sub>/O<sub>2</sub> gas mixture, with a sensitizer gas (SF<sub>6</sub>) as photo-absorbing species.</p><p>The infrared (IR) synthesis of SO<sub>3</sub> was performed in a flowing gas device equipped with a continuous trapping system of the reaction product. Vibrational energy transfer processes presumably should play a specific role in SO<sub>2</sub> excitation and reaction in the presence of SF<sub>6</sub>.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"33 6","pages":"Pages 557-562"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(92)90072-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53081142","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
Influence of low-frequency 1ƒ noise on threshold characteristics of photodetectors with charge accumulation 低频噪声对电荷积累光电探测器阈值特性的影响
Infrared physics Pub Date : 1992-11-01 DOI: 10.1016/0020-0891(92)90059-3
A.N. Sukhanov, V.V. Osipov, I.M. Mamedov
{"title":"Influence of low-frequency 1ƒ noise on threshold characteristics of photodetectors with charge accumulation","authors":"A.N. Sukhanov,&nbsp;V.V. Osipov,&nbsp;I.M. Mamedov","doi":"10.1016/0020-0891(92)90059-3","DOIUrl":"https://doi.org/10.1016/0020-0891(92)90059-3","url":null,"abstract":"<div><p>The well-known Viner-Levi expression is generalized for the case of low-frequency <span><math><mtext>1</mtext><mtext>ƒ</mtext></math></span> noise and finite duration of physical measurement. On this basis, formulae for calculation of the statical charge fluctuation in photodetectors are found. It is shown that for an integration time <span><math><mtext>T</mtext><msub><mi></mi><mn>0</mn></msub><mtext>ƒ</mtext><msub><mi></mi><mn>0</mn></msub><msup><mi></mi><mn>−1</mn></msup></math></span>, where ƒ<sub>0</sub> is thefrequency below which the photodetectors noise spectrum has the form of <span><math><mtext>I</mtext><mtext>ƒ</mtext></math></span>, the detectivity of IR photoreceivers does not depend practically on the integration time <em>T</em><sub>0</sub>.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"33 6","pages":"Pages 451-457"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(92)90059-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92011657","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
HgCdTe photodiodes—A device study HgCdTe光电二极管-器件研究
Infrared physics Pub Date : 1992-11-01 DOI: 10.1016/0020-0891(92)90067-4
Fei-Ming Tong , Yuan Haoxin , Yang Xiuzhen , N.M. Ravindra
{"title":"HgCdTe photodiodes—A device study","authors":"Fei-Ming Tong ,&nbsp;Yuan Haoxin ,&nbsp;Yang Xiuzhen ,&nbsp;N.M. Ravindra","doi":"10.1016/0020-0891(92)90067-4","DOIUrl":"10.1016/0020-0891(92)90067-4","url":null,"abstract":"<div><p>Recent developments in HgCdTe photovoltaic detector technology are reviewed. Some aspects of research work on device physics and technology are discussed. These include: the performance of HgCdTe photodiodes for IR fiber communication; the effects of field-enhanced generation-recombination and imperfections of the pn junction on HgCdTe photodiode I-V characteristics; and an analysis of the dependence of energy gap of HgCdTe on temperature and composition.</p></div>","PeriodicalId":81524,"journal":{"name":"Infrared physics","volume":"33 6","pages":"Pages 511-522"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-0891(92)90067-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53081074","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
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