Isotope-selective ionization utilizing molecular alignment and non-resonant multiphoton ionization

Akagi, Hiroshi; Kasajima, Tatsuya; Kumada, Takayuki ; Itakura, Ryuji; Yokoyama, Atsushi; Hasegawa, Hirokazu*; Oshima, Yasuhiro*

We demonstrate a laser nitrogen isotope separation, which is based on field-free alignment and angular dependent ionization of $^{14}$ N $_{2}$ and $^{15}$ N $_{2}$ isotopomers. A linearly-polarized short laser pulse (795 nm, 60 fs) creates rotational wave packets in the isotopomers, which periodically revive with different revival times as a result of different moments of inertia. Another linearly-polarized short laser pulse (795 nm, 60 fs) ionizes one of the isotopomers selectively as a result of their different angular distributions. In the present experiments, the ion yield ratio [= ( $^{15}$ N $_{2}$ $^{+}$ )/( $^{14}$ N $_{2}$ $^{+}$ )] can be changed in the range from 0.85 to 1.22, depending on the time delay between the two laser pulses.

Language	:	English
Journal	:	Applied Physics B
Volume	:	109
Number	:	1
Pages	:	p.75 - 80
Publication Year/Month	:	2012/10
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Paper URL	:	https://doi.org/10.1007/s00340-012-5222-3
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Keywords	:	no keyword
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Registration No. : AA20111095
JAEA Abstracts No. : 41000119
Paper Submission No. : 11699

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