Abstract
Photodecomposition processes of 2-, 3-, and 4-methylaniline cations induced by a moderately intense (∼10 11 W/cm 2) visible nanosecond laser field and an intense (∼10 15 W/cm 2) UV femtosecond laser field have been investigated using a tandem mass spectrometer. Highly unsaturated fragment cations such as C 6 H 2 + and C 6 H 3 + are dominantly produced by the nanosecond laser, while less unsaturated smaller fragment cations such as C 3 H 3 + , C 4 H 4 + , and C 5 H 5 + are produced mainly by the femtosecond laser. Ab initio calculations have also been performed to estimate the stable geometrical structures of C 6 H 2 + and C 6 H 3 + and those of possible intermediate ring compounds for discussing the photodecomposition pathways in intense laser fields.
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