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*

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.