English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

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.

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