Diff for "VALD3_van_der_Waals" - VALD Documentation

Differences between revisions 1 and 2

van der Waals damping parameter describes broadening of spectral lines due collisions with neutral particles, e.g. Hydrogen atoms. In VALD3 it can have three values:

if 0: it is not known;

if <0: log γ<sub>6</sub> in units of 1/(s*NH) at l0000 K (where NH is the number density of neutral Hydrogen atoms);

if >0 : two parameters as defined in Barklem et al. 2000A&AS..142..467. Integer part is cross-section σ, fractional part is velocity parameter α.

ValdWiki: VALD3_van_der_Waals (last edited 2024-09-18 13:40:50 by NikolaiPiskunov)

-  ⇤ ← Revision 1 as of 2024-09-17 08:57:19 → 
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+   ← Revision 2 as of 2024-09-17 08:59:17 → ⇥
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-if <0: log &gamma;_6 in units of 1/(s*NH) at l0000 K (where NH is the number density of neutral Hydrogen atoms);
+if <0: log &gamma;<sub>6</sub> in units of 1/(s*NH) at l0000 K (where NH is the number density of neutral Hydrogen atoms);