A High-Temperature Partition Function for H 3 +

Details A High-Temperature Partition Function for H 3 + A High-Temperature Partition Function for H 3 +

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...454l.169n&link_type=abstract

Astrophysical Journal Letters v.454, p.L169

Astronomy and Astrophysics

Astronomy

37

Molecular Data, Stars: Atmospheres

Scientific paper

{H}^{+}3 is the main supplier of electrons to metal-free stars below ~8000 K. To describe {H}^{+}3 properly it is important to know its partition function. Previous determinations of this function are based on extrapolations from lower temperatures. A new partition function is presented that is calculated by explicit ab initio computation of levels lying up to 15,000 cm-1 above the ground state and with J <= 20. The effect of all other bound levels of {H}^{+}3 , which is significant at higher temperatures, is included using a simple model based on Pade approximants. The new partition function is very significantly larger (up to a factor of 100 in some cases) than previous estimates above 3000 K.

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