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Bromine-isotope selective ionization using field-free alignment of IBr isotopologues with a switched nanosecond laser pulse

Akagi, Hiroshi*; Kumada, Takayuki  ; Otobe, Tomohito*; Itakura, Ryuji*; Hasegawa, Hirokazu*; Oshima, Yasuhiro*

We demonstrate isotope selective ionization of I$$^{79}$$Br and I$$^{81}$$Br isotopologues using field-free alignment induced by a linearly-polarized nanosecond laser pulse with rapid turn off at the maximum. Following the switched nanosecond pulse irradiation, a 60-fs laser pulse ionizes one of the isotopologues preferentially. The ion yield ratio $$I$$(I$$^{81}$$Br$$^+$$)/$$I$$(I$$^{79}$$Br$$^+$$) varies in the range of 0.93-1.06, depending on time delay between the pulses. This is the first demonstration of laser isotope separation of heavy elements using field-free alignment and angular dependent ionization.

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Category:Chemistry, Multidisciplinary

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