Molecular Iodine Fluorescence Spectra Generated with Helium-Neon Lasers for Spectrometer Calibration

Author: Williamson, J. Charles

Source: Applied Spectroscopy, Volume 64, Issue 12, Pages 318A-366A and 1311-1452 (December 2010) , pp. 1419-1422(4)

Publisher: Society for Applied Spectroscopy

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Abstract:

Gas-phase molecular iodine laser-induced fluorescence (LIF) spectra were recorded out to 815 nm at 1 cm–1 resolution using green, yellow, and red helium-neon (HeNe) lasers as excitation sources. Nine previously unreported I2 BX absorption transitions accessed by these lasers were identified, and specific rovibronic transition assignments were made for two hundred LIF peaks—more than sixty per laser. These I2 LIF peaks can be used to calibrate the vacuum wavenumber coordinate of spectrometers to better than 0.1 cm–1 accuracy. In particular, green HeNe excitation of the I2 R(106) 28-0 transition leads to strong fluorescence well suited for calibration, with a rotational doublet spacing of 15 cm–1 and a doublet-to-doublet spacing of 190 cm–1. Calibration by HeNe I2 LIF may be an especially valuable technique for Raman spectroscopy applications.

Keywords: CCD; CHARGE-COUPLED DEVICE; HELIUM-NEON LASER; LASER-INDUCED FLUORESCENCE; LIF; MOLECULAR IODINE; RAMAN SPECTROSCOPY; SPECTROMETER CALIBRATION

Document Type: Short Communication

DOI: http://dx.doi.org/10.1366/000370210793561637

Affiliations: Department of Chemistry, Willamette University, Salem, Oregon 97301. jcwillia@willamette.edu

Publication date: December 1, 2010

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