Abstract

Gas-phase molecular iodine laser-induced fluorescence (LIF) spectra were recorded out to 815 nm at 1 cm<sup>–1</sup> resolution using green, yellow, and red helium-neon (HeNe) lasers as excitation sources. Nine previously unreported I<sub>2</sub> <i>B</i>←<i>X</i> 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 I<sub>2</sub> LIF peaks can be used to calibrate the vacuum wavenumber coordinate of spectrometers to better than 0.1 cm<sup>–1</sup> accuracy. In particular, green HeNe excitation of the I<sub>2</sub> <i>R</i>(106) 28-0 transition leads to strong fluorescence well suited for calibration, with a rotational doublet spacing of 15 cm<sup>–1</sup> and a doublet-to-doublet spacing of 190 cm<sup>–1</sup>. Calibration by HeNe I<sub>2</sub> LIF may be an especially valuable technique for Raman spectroscopy applications.

PDF Article

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription