Transient absorption of electron beam excited helium in the UV and VUV
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.
- Publication:
-
Optics Communications
- Pub Date:
- May 1984
- DOI:
- 10.1016/0030-4018(84)90143-3
- Bibcode:
- 1984OptCo..50...95L
- Keywords:
-
- Electron Pumping;
- Excimer Lasers;
- Gas Lasers;
- Helium;
- Photoionization;
- Ultraviolet Absorption;
- Ultraviolet Lasers;
- Absorption Spectra;
- Extreme Ultraviolet Radiation;
- Gas Mixtures;
- Ionization Cross Sections;
- Metastable State;
- Population Inversion;
- Lasers and Masers