P. Antoine et al., A MEASUREMENT OF THE 2-PHOTON IONIZATION OF ATOMIC-HYDROGEN H(2S) NEAR THE RESONANCE WITH THE 3P STATE, Journal of physics. B, Atomic molecular and optical physics, 29(22), 1996, pp. 5367-5376
We describe a new experiment dealing with the multiphoton ionization o
f metastable atomic hydrogen H(2s). The ion yield has been measured in
a relative way but it provides absolute photoionization rates. In the
present contribution, the wavelength is tuned in the vicinity of the
2s-3p transition and the laser intensity is in the 10(7)-5 x 10(10) W
cm(-2) range. Experimental photoionization rates and resonance width a
re found to be in agreement with theoretical predictions.