標題: Accurate intensity calibration for low wavenumber (-150 to 150cm(-1)) Raman spectroscopy using the pure rotational spectrum of N-2
作者: Okajima, Hajime
Hamaguchi, Hiro-o
應用化學系
應用化學系分子科學碩博班
Department of Applied Chemistry
Institute of Molecular science
關鍵字: intensity calibration;rotational Raman scattering;low wavenumber Raman spectroscopy;temperature determination;Stokes/anti-Stokes ratio
公開日期: 1-Nov-2015
摘要: We report on an accurate intensity calibration method for low wavenumber Raman spectroscopy. It uses the rotational Raman spectrum of N-2. The intensity distributions in the rotational Raman spectra of diatomic molecules are theoretically well established. They can be used as primary intensity standards for intensity calibration. The intensity ratios of the Stokes and anti-Stokes transitions originating from the same rotational levels are not affected by thermal population. Taking the effect of rotation-vibration interactions appropriately into account, we are able to calculate these intensity ratios theoretically. The comparison between the observed and calculated ratios of the N-2 pure rotational spectrum provides an accurate relative sensitivity curve (error similar to 5 x 10(-4)) in the wavenumber region of -150 to 150 cm(-1). We determine the temperature of water solely from the low wavenumber Raman spectra, using a thus calibrated spectrometer. The Raman temperature shows an excellent agreement with the thermocouple temperature, with only 0.5 K difference. The present calibration technique will be highly useful in many applications of low wavenumber quantitative Raman spectroscopy. Copyright (C) 2015 John Wiley & Sons, Ltd.
URI: http://dx.doi.org/10.1002/jrs.4731
http://hdl.handle.net/11536/129577
ISSN: 0377-0486
DOI: 10.1002/jrs.4731
期刊: JOURNAL OF RAMAN SPECTROSCOPY
Volume: 46
Issue: 11
起始頁: 1140
結束頁: 1144
Appears in Collections:Articles