{"title":"Argon I Standards for Emission Spectrometry","authors":"J. Brault","doi":"10.1364/hrfts.1992.thb2","DOIUrl":null,"url":null,"abstract":"For over a decade, users of the FTS at the McMath Solar Telescope of the National Solar Observatory have had access to a simple but precise working wavenumber standard for absorption spectra in the form of a short sealed cell containing 10 or 20 Torr of N2O. Because of the high pressure, the observed wavenumbers are not those of the unperturbed molecule, but a direct calibration of the 0002 band at 4417 cm−1in this cell against the accurately known P(7) transition in CH4 yielded wavenumbers with a precision of the order of 0.000002 cm−1 and an accuracy thought to be at least 0.00001 cm−1 (Brault [1]). Some years later, this band was observed by Pollock, et al. [2] using laser heterodyne techniques, and when our cell values are corrected using the pressure shift which they observed, the absolute agreement is quite satisfactory: (NSO - Pollock, calculated) = 0.000035 ± .0000035 cm−1; note that the absolute uncertainty in Pollock, et al. is quoted as .000080 cm−1.","PeriodicalId":159025,"journal":{"name":"High Resolution Fourier Transform Spectroscopy","volume":"21 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":"High Resolution Fourier Transform Spectroscopy","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1364/hrfts.1992.thb2","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
For over a decade, users of the FTS at the McMath Solar Telescope of the National Solar Observatory have had access to a simple but precise working wavenumber standard for absorption spectra in the form of a short sealed cell containing 10 or 20 Torr of N2O. Because of the high pressure, the observed wavenumbers are not those of the unperturbed molecule, but a direct calibration of the 0002 band at 4417 cm−1in this cell against the accurately known P(7) transition in CH4 yielded wavenumbers with a precision of the order of 0.000002 cm−1 and an accuracy thought to be at least 0.00001 cm−1 (Brault [1]). Some years later, this band was observed by Pollock, et al. [2] using laser heterodyne techniques, and when our cell values are corrected using the pressure shift which they observed, the absolute agreement is quite satisfactory: (NSO - Pollock, calculated) = 0.000035 ± .0000035 cm−1; note that the absolute uncertainty in Pollock, et al. is quoted as .000080 cm−1.