Blake, Geoffrey A. and Laughlin, K. B. and Cohen, R. C. and Busarow, Kerry L. and Saykally, R. J. (1987) Laboratory measurement of the pure rotational spectrum of vibrationally excited HCO^+ (v_2 = 1) by far-infrared laser sideband spectroscopy. Astrophysical Journal Letters, 316 . L45-L48. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20120912-085707147
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Laboratory observations of the pure rotational spectrum of HCO^+ in its lowest excited bending state (v_1, v^l_2 v_3)_= (0,1^1,0) 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 molecular cloud cores and circumstellar envelopes. As the HCO^+ abundance is tied directly to the gas fractional ionization, it is probable that the vibrationally excited formyl ion transitions will provide high-contrast observations of shocked molecular material, rather than the more quiescent, radiatively heated gas surrounding stellar sources detected with the few vibrationally excited neutral species observed to date.
|Additional Information:||© 1987 American Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1987 January 12; accepted 1987 February 9. G. A. B. and R. J. S. gratefully acknowledge financial support provided by the Berkeley Miller Research Institute, and K. B. L. thanks the NSF for a predoctoral fellowship. This work was supported by the Structure and Thermodynamics Program of the National Science Foundation, grant CHE-8402861.|
|Subject Keywords:||interstellar: molecules; laboratory spectra|
|Official Citation:||Laboratory measurement of the pure rotational spectrum of vibrationally excited HCO^+ (v_2 = 1) by far-infrared laser sideband spectroscopy Blake, Geoffrey A.; Laughlin, K. B.; Cohen, R. C.; Busarow, Kerry L.; Saykally, R. J.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||12 Sep 2012 16:24|
|Last Modified:||26 Dec 2012 16:09|
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