Cross Sections for the Destruction of 1 - to 25-keV/Nucleon $X {}^{1}Σ_{g}^{+}$ and $c {}^{3}{II}_{u}$ Hydrogen Molecules in Collisions with $H_{2}$ Gas

Measurements of the cross sections for the total loss and the ionization of

X {}^{1}Σ_{g}^{+}

H_{2}

[

1 <~ E

(keV/nucleon) ≤ 25] and

c {}^{3}Π_{u}

H_{2}

molecules [

3 <~ E

(keV/nucleon) ≤ 20] in collisions with

H_{2}

gas are reported. The

c {}^{3}Π_{u}

molecules were formed by electron capture by

H_{2}^{+}

ions in Mg vapor. The total-loss cross section of the

c {}^{3}Π_{u}

state is about 5 times larger than the total-loss cross section of the

X {}^{1}Σ_{g}^{+}

state.

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Cross Sections for the Destruction of 1 - to 25-keV/NucleonXΣg+1andcIIu3Hydrogen Molecules in Collisions withH2Gas