LABORATORY MEASUREMENT OF THE PURE ROTATIONAL SPECTRUM OF VIBRATIONALLY EXCITED HCO+ (v2 = 1) BY FAR-INFRARED LASER SIDEBAND SPECTROSCOPY

Abstract

Laboratory observations of the pure rotational spectrum of Hco+ in its lowest excited bending state (v 1 , vL v 3)_= (0,1\0) are reported. Because of their severe excitation requirements, such vibrational satellites and the high-J ground-state lines also measured here sample only hot, dense regions of matter in active ~o~ec~ar cl~m? cores and circumstellar envelopes. As the Hco+ abundance is tied directly to the gas fractional wmzatw~, 1t 1s probable that the vib~ationally excited formyl ion transitions will provide high-contrast observatiOns of shocked ~olecular ma~en~, rather than the more quiescent, radiatively heated gas surrounding stellar sources detected With the few v1brat1onally excited neutral species observed to date.

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