Electron Capture into the $n = 3$ States of H by Fast $H^{+}$ Impact on Gases

Absolute cross sections for electron capture into the

3 p

and

3 d

states of hydrogen have been measured for 10- to 100-keV proton impact on He, Ne, Ar,

H_{2}

N_{2}

, and

O_{2}

. Improved

3 s

cross sections are presented for these gases from 10 to 120 keV. An apparent maximum in the

3 p

cross section occurs in this energy range for all gases. The

3 d

cross sections decrease monotonically with increasing impact energy according to an

\exp [- {(\frac{E}{K})}^{\frac{1}{2}}]

relationship, where

E

is the impact energy and

K

is a constant, with the exception of helium which shows a maximum in the

3 d

cross section between 15 and 20 keV. The value of

K

is identical for all the diatomic gases. Balmer-

α

cross sections are synthesized from these results. Polarization of the

3 d \to 2 p

radiation is reported.

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Electron Capture into then=3States of H by FastH+Impact on Gases