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Oral presentation

Isotope selection using intense laser induced molecular alignment and angle-dependent ionization

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

no journal, , 

We demonstrate the isotope selection with molecular alignment and angle-dependent ionization in intense laser fields. The 14-N2 and 15-N2 mixed gas is irradiated with a linearly polarized femtosecond laser pulse for creation of rotational wavepackets. After a certain delay when one of two isotopologues is aligned along the laser polarization direction, another linearly polarized femtosecond laser pulse is shined for ionization. It is confirmed that the ionization yield ratio between the two isotopologues can be changed as a function of the delay between the two laser pulses.

Oral presentation

Isotope selective ionization of N$$_{2}$$ isotopologues utilizing rotational coherence and angular dependent ionization

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

no journal, , 

In the present work, the isotope separation utilizing the rotational coherence is demonstrated experimentally for the first time, by the isotopically selective ionization of N$$_{2}$$ isotopomers via the non-resonant multiphoton ionization process. A gas mixture of 14-N$$_{2}$$ and 15-N$$_{2}$$ was irradiated with a pair of linearly-polarized short laser pulses. The present experiment indicated that the ion yield ratioI(15N$$_{2}$$$$^{+}$$)/I(14N$$_{2}$$$$^{+}$$) can be changed in the range from 0.85 to 1.22, depending on the time delay between the two pulses.

Oral presentation

Displacement of rotational state distribution of the nitrogen molecule by optical pulse train

Yokoyama, Keiichi; Kasajima, Tatsuya*

no journal, , 

For the demonstration of isotope separation scheme based on the coherent quantum control, we irradiate a train of femtosecond laser pulses to the nitrogen molecule in the ambient air and measure the rotational state distribution of them before and after the irradiation. As a result, small but significant displacement of rotational state distribution has been confirmed. The amount of displacement roughly coincides with theoretical prediction. The pulse train is formed by a three-stage Michelson interferometer using the output pulses from a femtosecond Ti:Sapphire laser. Coherent anti-Stokes Raman scattering spectroscopy is utilized to measure the rotational state distribution.

Oral presentation

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*

no journal, , 

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 ($$lambda$$$$sim$$795 nm, $$Delta$$$$tau$$$$sim$$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.

Oral presentation

Molecular laser isotope separation without tunable lasers; Isotope-selective ionization utilizing molecular alignment and angular dependent ionization

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

no journal, , 

Oral presentation

Displacement of rotational-state distribution in diatomic molecules with a train of femtosecond laser pulses

Yoshida, Fumiko; Kasajima, Tatsuya*; Matsuoka, Leo; Yokoyama, Keiichi

no journal, , 

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