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In order to increase the ion-detection efficiency of the pressure measurement method using nonresonant multiphoton ionization, an ion-detection head was improved. Using this head, pressure measurements were carried out for H 2 and Xe in the extreme high vacuum region. As a result, for H 2 , by optimizing an incident ion energy, the efficiency increased by a factor of about 2.5. For...
The second harmonic of a picosecond Nd:YAG laser was used to nonresonantly ionize Xe atoms in vacuum. The spatial distribution of the produced ions was observed by our ion-imaging method. Time of flight spectrum of the produced ions was also measured simultaneously. Xe 2+ and Xe 3+ ions were detected around the center of the ionization volume. The produced amount of multiply...
The current status and possibility of XHV measurement by laser ionization using second harmonics of a picosecond YAG laser are discussed. Under the condition that incident laser energy was 30 mJ/pulse and the laser beam was focused with a spherical lens (focal length f = 250 mm) to a power density sufficient for the saturation of H 2 ionization at the focal point, the minimum pressure in an...
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