Observation of the 2ν2(l=2)←0 overtone band of H+3

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Abstract
The overtone band of 2ν2(l=2)←0 of H+3 in the 2 μm infrared region has been observed in absorption by using a difference frequency laser spectrometer. The LiIO3 nonlinear optical system assembled by Bawendi and the bidirectional multiple path optical arrangement with velocity modulation have enabled us to observe 34 vibrational–rotation transitions from 5094 to 4557 cm−1. Liquid‐N2 cooled plasmas were used for transitions involving low rotational levels, while gaseous‐N2 cooled plasmas were used for high rotational levels, up to J,K=(9,9). From the relative intensities of the transitions, rotational temperature has been estimated to be ∼270 K for the former and ∼1300 K for the latter. The Δ‖k−l‖=±3 selection rule of the overtone band allows us to determine the absolute energy level values by combining the frequencies of the overtone band with those of the fundamental and hot bands.

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