Direct imaging of spatial distribution of ions generated by nonresonant multiphoton ionization of H2 gas

Shingo Ichimura, Shigeyuki Sekine, Hans Joachim Steffen, Kiyohide Kokubun, Hazime Shimizu

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The spatial distribution of ions generated by nonresonant multiphoton ionization (NRMPI) of H2 gas with a picosecond YAG laser was clearly observed with a new detection system consisted of a static lens, a microchannel plate (MCP) intensifies a charge-coupled device (CCD) camera, and an image processor. The ions were distributed along a straight line, reflecting the ion generation along the laser beam path. The ionization region had a spindle shape with the maximum diameter at the focal point of a spherical lens used for laser beam focussing. The size of the ionization region was about 2.5 mm in length and 0.05 mm in diameter when the gas pressure was 1 × 10–5 Pa and incident laser energy was 12 mJ/pulse. The laser power density at the focal point was about 2 × 1013 W/cm2.

Original languageEnglish
Pages (from-to)L135-L138
JournalJapanese journal of applied physics
Volume33
Issue number1
DOIs
Publication statusPublished - 1994 Jan
Externally publishedYes

Keywords

  • H molecules
  • Image processing
  • Multiphoton ionization
  • Pressure measurement
  • YAG laser

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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