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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 B ← X 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 cm1 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

Spectrometer calibration Charge-coupled device CCD Molecular iodine Laser-induced fluorescence LIF Helium-neon laser Raman spectroscopy

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

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