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Home All issues Volume 508 / No 3 (December IV 2009) A&A, 508 3 (2009) 1539-1569 Full HTML
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Table 1:

Scattering and absorption processes involving H and He nuclei, considered in this work.
Process Symbol Reaction References and Comments
Rayleigh $\sigma_{\rm Ray}$($\HH_2$) $\HH_2 + h\nu \rightarrow \HH_2 + h\nu'$ Dalgarno & Williams (1962)
$\sigma_{\rm Ray}$( $\textup{H}$) $\textup{H}+ h\nu \rightarrow \textup{H}+ h\nu'$ Dalgarno (1962)
$\sigma_{\rm Ray}$( $\textup{He}$) $\textup{He}+ h\nu \rightarrow \textup{He}+ h\nu'$
Thomson Th( $\textup{e}^-$) $\textup{e}^-+ h\nu \rightarrow \textup{e}^-+ h\nu'$ NIST (2006 CODATA recommended value)
free-free $\sigma_{\rm ff}$( $\textup{H}^-$) $\textup{H}+\textup{e}^-+h\nu \rightarrow \textup{H}+ \textup{e}^-$ John (1988)
$\sigma_{\rm ff}$( $\textup{H}$) $\textup{H}^+ + \textup{e}^-+ h\nu \rightarrow \textup{H}^+ + \textup{e}^-$ Method as in Kurucz (1970) based on Karsas & Latter (1961)
$\sigma_{\rm ff}$($\HH_2^+$) $\textup{H}^+ + \textup{H}+ h\nu \rightarrow \textup{H}^+ + \textup{H}$ Lebedev et al. (2003)
$\sigma_{\rm ff}$($\HH_2^-$) $ \HH_2 + \textup{e}^-+h\nu \rightarrow \HH_2 + \textup{e}^-$ John (1975)
$\sigma_{\rm ff}$($\HH_3$) $\HH_3^+ + \textup{e}^-+ h\nu \rightarrow \HH_3^+ + \textup{e}^-$ $\sigma_{\rm ff}(\HH_3)=\sigma_{\rm ff}(\textup{H})$(assumed)
$\sigma_{\rm ff}$( $\textup{He}^-$) $\textup{He}+ \textup{e}^-+ h\nu \rightarrow \textup{He}+ \textup{e}^-$ Carbon et al. (1969)
$\sigma_{\rm ff}$( $\textup{He}$) $\textup{He}^+ + \textup{e}^-+ h\nu \rightarrow \textup{He}^+ + \textup{e}^-$ $\sigma_{\rm ff}(\textup{He})=\sigma_{\rm ff}(\textup{H})$(assumed)
$\sigma_{\rm ff}$( $\textup{He}^+$) $\textup{He}^{++} + \textup{e}^-+ h\nu \rightarrow \textup{He}^{++} + \textup{e}^-$ $\sigma_{\rm ff}(\textup{He}^+)=\sigma_{\rm ff}(\textup{H})$(assumed)
bound-free $\sigma_{\rm bf}$( $\textup{H}^-$) $\textup{H}^- + h\nu \rightarrow \textup{H}+ \textup{e}^-$ John (1998)
$\sigma_{\rm bf}$( $\textup{H}$) $\textup{H}+ h\nu \rightarrow \textup{H}^+ + \textup{e}^-$ Method as in Kurucz (1970) based on
Gingerich (1969) and Karsas & Latter (1991)
$\sigma_{\rm bf}$($\HH_2^+$) $\HH_2^+ + h\nu \rightarrow \textup{H}^+ + \textup{H}$ Lebedev et al. (2003)
$\sigma_{\rm bf}$( $\textup{He}$) $\textup{He}+ h\nu \rightarrow \textup{He}^+ + \textup{e}^-$ Method as in Kurucz (1970) based on
Gingerigh (1964) and Hunger & Van Blerkom (1967)
$\sigma_{\rm bf}$( $\textup{He}^+$) $\textup{He}^+ + h\nu \rightarrow \textup{He}^{++} + \textup{e}^-$ Hunger & Van Blerkom (1967)
bound-bound $\sigma_{\rm bb}$( $\textup{H}$) $\textup{H}+ h\nu \rightarrow \textup{H}^*$ Kurucz (1970) including Stark broadening
Collision
induced
absorption 		$\sigma_{\rm CIA}$( $\HH_2/\HH_2$) $\HH_2+\HH_2+h\nu \rightarrow \HH_2+\HH_2$ $600\textup{ K}<T<7000 \textup{ K}$, $20\textup{ cm}^{-1}<\tilde{\nu}<20~000\textup{ cm}^{-1}$
Borisow et al. (1997)
$\sigma_{\rm CIA}$( $\HH_2/\textup{He}$) $\HH_2+\textup{He}+h\nu \rightarrow \HH_2+\textup{He}$ $1000\textup{ K}<T<7000\textup{ K}$, $25\textup{ cm}^{-1}y<\tilde{\nu}<20~088\textup{ cm}^{-1}$
Jørgensen et al. (2000)
$\sigma_{\rm CIA}$( $\textup{H}/\textup{He}$) $\textup{H}+\textup{He}+h\nu \rightarrow \textup{H}+\textup{He}$ $1500\textup{ K}<T<10~000 \textup{ K}$, $50\textup{ cm}^{-1}<\tilde{\nu}<1~1000\textup{ cm}^{-1}$
Borisow et al. (2001)


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