A High-Temperature Partition Function for [FORMULA][F][RM]H[/RM][SUP]+[/SUP][INF]3[/INF][/F][/FORMULA] | Zendy

L. Neale | Zendy; Jonathan Tennyson | Zendy

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A High-Temperature Partition Function for [FORMULA][F][RM]H[/RM][SUP]+[/SUP][INF]3[/INF][/F][/FORMULA]

Author(s) -

L. Neale,

Jonathan Tennyson

Publication year - 1995

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/309789

Subject(s) - physics , partition function (quantum field theory) , partition (number theory) , function (biology) , ab initio , atomic physics , ground state , combinatorics , quantum mechanics , mathematics , evolutionary biology , biology

H3+ is the main supplier of electrons to metal-free stars below ~8000 K. To describe H3+ 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 H3+, 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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