TY - JOUR
T1 - Direct imaging of spatial distribution of ions generated by nonresonant multiphoton ionization of H2 gas
AU - Ichimura, Shingo
AU - Sekine, Shigeyuki
AU - Steffen, Hans Joachim
AU - Kokubun, Kiyohide
AU - Shimizu, Hazime
PY - 1994/1
Y1 - 1994/1
N2 - 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.
AB - 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.
KW - H molecules
KW - Image processing
KW - Multiphoton ionization
KW - Pressure measurement
KW - YAG laser
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U2 - 10.1143/JJAP.33.L135
DO - 10.1143/JJAP.33.L135
M3 - Article
AN - SCOPUS:0028207695
SN - 0021-4922
VL - 33
SP - L135-L138
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
IS - 1
ER -