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Laser filamentation provides a convenient source of broadband, intrinsically short radiation that is an ideal source for impulsive vibrational and rotational excitation of polyatomic molecules. Here we present experimental and theoretical results achieved to date.
Mass spectra are measured for 2′-, 3′- and 4′-(ortho, meta and para) methyl substituted alkyl phenyl ketones excited at wavelengths ranging from 1200 to 1500nm in the strong field regime. The selective loss of a methyl group from the acetyl group of the parent molecular ion upon excitation at ∼1370nm is attributed to an electronic resonance between ground D0 and excited D2 state of the radical cation...
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