Silvia Casu and Cesare Cecchi-Pestellini 2005 J. Phys.: Conf. Ser. 6 191 doi:10.1088/1742-6596/6/1/022
Silvia Casu and Cesare Cecchi-Pestellini
Show affiliationsThe importance of the formation pumping on the rovibrational level distribution of H2 is revisited. A detailed comparison of different formation mechanisms on dust surfaces and in the gas-phase is carried out, and it is found that dust surface formation dominates the formation pumping. It is shown that formation pumping in a cold gas can mimic the excitation conditions found in hotter regions. The presence of a significant fraction of molecular hydrogen in very high rotational levels observed towards OMC-1 Peak 1 is explained by means of pumping by newly formed H2 molecules and does not require high temperature gas.
98.58.Bz Atomic, molecular, chemical, and grain processes
98.58.Ca Interstellar dust grains; diffuse emission; infrared cirrus
Issue 1 (2005)
Silvia Casu and Cesare Cecchi-Pestellini 2005 J. Phys.: Conf. Ser. 6 191
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