Isotope selective ionization utilizing control of molecular rotation with femtosecond laser pulse

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

We demonstrate laser nitrogen isotope separation, which is based on field-free alignment and angular dependent ionization of $^{14}$ N $_{2}$ and $^{15}$ N $_{2}$ isotopologues. A linearly-polarized short laser pulse (795 nm, 60 fs) creates rotational wave packets in the isotopologues, which periodically revive with different revival times as a result of different moments of inertia. Another linearly-polarized short laser pulse ionizes one of the isotopologues selectively as a result of their different angular distributions. In the present experiments, the ion yield ratio R [= I( $^{15}$ N $_{2}$ )/I( $^{14}$ 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	:	Japanese
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Meeting title	:	第11回同位体科学研究会
Held date	:	2013/03
Location (city)	:	東京
Location (country)	:	日本
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Registration No. : BB20123373
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