{"title":"微波和红外分子光谱冲击展宽和位移的无截止理论","authors":"R. Leavitt, D. Korff","doi":"10.1364/sam.1980.wp5","DOIUrl":null,"url":null,"abstract":"The semiclassical Anderson-Tsao-Curnutte (ATC) impact theory [1,2] of pressure broadening in molecular spectra has been successful in calculations of linewidths and shifts in the microwave and infrared regimes. However, the theory suffers from a fundamental defect in that, for small impact parameter, b, the interruption function, S(b), attains unphysically large values. In an attempt to circumvent this difficulty, Murphy and Boggs [3] developed an alternative method that used an exponential expansion of the collision matrix elements; this expansion led to finite values of the matrix elements for all impact parameters. Cattani [4] grafted the Murphy-Boggs expansion onto the ATC theory; a similar result was later derived by Salesky and Korff [5]. These latter three approaches neglect the important reorientation terms that were shown by Gordon [6] to be significant.","PeriodicalId":199214,"journal":{"name":"Topical Meeting on Spectroscopy in Support of Atmospheric Measurements","volume":"279 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Cutoff-Free Theory of Impact Broadening and Shifting of Microwave and Infrared Molecular Spectra\",\"authors\":\"R. Leavitt, D. Korff\",\"doi\":\"10.1364/sam.1980.wp5\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The semiclassical Anderson-Tsao-Curnutte (ATC) impact theory [1,2] of pressure broadening in molecular spectra has been successful in calculations of linewidths and shifts in the microwave and infrared regimes. However, the theory suffers from a fundamental defect in that, for small impact parameter, b, the interruption function, S(b), attains unphysically large values. In an attempt to circumvent this difficulty, Murphy and Boggs [3] developed an alternative method that used an exponential expansion of the collision matrix elements; this expansion led to finite values of the matrix elements for all impact parameters. Cattani [4] grafted the Murphy-Boggs expansion onto the ATC theory; a similar result was later derived by Salesky and Korff [5]. These latter three approaches neglect the important reorientation terms that were shown by Gordon [6] to be significant.\",\"PeriodicalId\":199214,\"journal\":{\"name\":\"Topical Meeting on Spectroscopy in Support of Atmospheric Measurements\",\"volume\":\"279 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1900-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Topical Meeting on Spectroscopy in Support of Atmospheric Measurements\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1364/sam.1980.wp5\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Topical Meeting on Spectroscopy in Support of Atmospheric Measurements","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1364/sam.1980.wp5","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
摘要
分子光谱中压力展宽的半经典anderson - tao - curnutte (ATC)冲击理论[1,2]已经成功地计算了微波和红外波段的线宽和位移。然而,该理论存在一个根本性的缺陷,即对于较小的冲击参数b,中断函数S(b)会达到非物理上的大值。为了规避这一困难,Murphy和Boggs[3]开发了一种替代方法,使用碰撞矩阵元素的指数展开;这种扩展导致所有冲击参数的矩阵元素的有限值。Cattani[4]将Murphy-Boggs展开嫁接到ATC理论上;Salesky和Korff后来也得出了类似的结果[5]。后三种方法忽略了Gordon[6]所显示的重要的重新定位术语。
Cutoff-Free Theory of Impact Broadening and Shifting of Microwave and Infrared Molecular Spectra
The semiclassical Anderson-Tsao-Curnutte (ATC) impact theory [1,2] of pressure broadening in molecular spectra has been successful in calculations of linewidths and shifts in the microwave and infrared regimes. However, the theory suffers from a fundamental defect in that, for small impact parameter, b, the interruption function, S(b), attains unphysically large values. In an attempt to circumvent this difficulty, Murphy and Boggs [3] developed an alternative method that used an exponential expansion of the collision matrix elements; this expansion led to finite values of the matrix elements for all impact parameters. Cattani [4] grafted the Murphy-Boggs expansion onto the ATC theory; a similar result was later derived by Salesky and Korff [5]. These latter three approaches neglect the important reorientation terms that were shown by Gordon [6] to be significant.