Abstract
Hot ions of 9-cyanophenanthrene were produced by multiphoton ionization at 193 nm. The radiative cooling rate of the hot ions was measured thermometrically using time-resolved photodissociation (TRPD) as the internal energy probe. In this application of the TRPD technique two-photon dissociation of the ions at 355 nm was used to measure the rate for the C 2H 2 loss channel as a function of cooling time following the ionization laser pulse. Since the TRPD rate depends on the ion internal energy the dissociation rate measurements gave a cooling curve for the initially hot ions. The radiative cooling time constant was measured as 330 ms. The cooling rate observed here is faster than the radiative cooling rates of comparable nonpolar ions. This enhancement of radiative cooling is attributed to high vibrational transition dipole moments associated with the polar CN group.
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