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3/26/17
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Maxwell Boltzmann Distribu:on Num
ber o
f Par:cles Reduced mass of par:cles
with rela:ve speeds v
Example Neutral (H or H2) Collision Rates
Spitzer -‐ Physical Processes in the ISM
3/26/17
2
Table of Collision Strengths with e-‐
Spitzer -‐ Physical Processes in the ISM
Leiden Collision Rate Database
3/26/17
3
Table of Ion Cri:cal Densi:es with e-‐
Cri:cal Densi:es for Molecules Op#cally thin cri#cal density for collisions with H2 (Shirley 2015)
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