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 1
Externally publishedYes

Fingerprint

Spatial distribution
Ionization
spatial distribution
Imaging techniques
ionization
Laser beams
Lasers
Lenses
Ions
Gases
lenses
gases
laser beams
ions
spindles
microchannel plates
CCD cameras
Microchannels
gas pressure
lasers

Keywords

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

ASJC Scopus subject areas

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

Cite this

Direct imaging of spatial distribution of ions generated by nonresonant multiphoton ionization of H2 gas. / Ichimura, Shingo; Sekine, Shigeyuki; Steffen, Hans Joachim; Kokubun, Kiyohide; Shimizu, Hazime.

In: Japanese Journal of Applied Physics, Vol. 33, No. 1, 01.01.1994, p. L135-L138.

Research output: Contribution to journalArticle

Ichimura, Shingo ; Sekine, Shigeyuki ; Steffen, Hans Joachim ; Kokubun, Kiyohide ; Shimizu, Hazime. / Direct imaging of spatial distribution of ions generated by nonresonant multiphoton ionization of H2 gas. In: Japanese Journal of Applied Physics. 1994 ; Vol. 33, No. 1. pp. L135-L138.
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