Abstract
The transient absorption in helium at 10 bars after excitation by depositing 0.17 J/cm 3 of energy supplied by an electron beam has been investigated. For λ < 260 nm the absorption is caused by photoionisation of He ∗( 3S) and He ∗ 2(a). The experimental cross sections agree with calculated values. For λ > 260 nm several absorption lines appear which are due to transitions from He ∗( 3S) and He ∗ 2(a) to Rydberg levels. Since He ∗( 1S) is quenched rapidly, its absorption is observed only at the 396.5 nm absorption line.
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