Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...543..271m&link_type=abstract
The Astrophysical Journal, Volume 543, Issue 1, pp. 271-274.
Astronomy and Astrophysics
Astronomy
5
Ism: Molecules, Molecular Processes, Submillimeter
Scientific paper
We have performed pressure broadening and time resolved double resonance studies on three rotational transitions (212<--111, 211<--110, and 313<--212) of formaldehyde (H2CO) in collision with helium and hydrogen at low temperatures (T<=16 K). This was achieved by applying the collisional cooling method. The purpose of this study was to compare laboratory measurements with the theory used to explain the anomalous absorption of interstellar formaldehyde against the 2.7 K background. Our laboratory measurements are generally consistent with this theory for H2CO-He collisions. However, we observe significantly different pressure broadening cross sections for H2CO-H2 collisions, which calls into question the substitution of helium for hydrogen as a collision partner in astrophysical calculations.
de Lucia Frank C.
Mengel Markus
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