Phys. Rev. Lett. 82, 4607–4610 (1999)Absolute Photoionization Cross Sections of Excited He States in the Near-Threshold RegionReceived 4 January 1999; published in the issue dated 7 June 1999 The absolute photoionization cross sections of the excited, short-lived He* 1s2p 1P and 1s3p 1P states are determined experimentally in the region close to the He+ 1s 2S threshold (from 0 to 2 eV). The intermediate He* states are prepared by photoabsorption of a high-order harmonic of an intense picosecond tunable laser and subsequently ionized by absorption of photons of several fixed frequencies, ranging from the near infrared to the ultraviolet. Our experimental results quantitatively confirm earlier theoretical work. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.4607
DOI:
10.1103/PhysRevLett.82.4607
PACS:
32.70.Fw, 32.80.Fb, 42.65.Ky
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