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.

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