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- W2275492021 abstract "Evidence for the multiphoton dissociation of an electronic metastable state of CF/sub 3/I/sup +/ with CO/sub 2/ laser radiation is presented. Only those ions possessing sufficient internal excitation before irradiation can be dissociated. Photodissociation results primarily from resonant absorption by the n/sub 1/ vibrational mode of CF/sub 3/I/sup +/ in the higher of the two, spin--orbit levels of the ground electronic state X /sup 2/E/sub 1/2/. Only the lowest energy decomposition channel is observed; this yields CF/sup +//sub 3/ and I. Spin--orbit and vibrational relaxation compete with photodissociation. At CF/sub 3/I pressures below 2 x 10/sup -7/ Torr, the collisional relaxation rate is proportional to CF/sub 3/I pressure k/sub c/ = (3.1 +- 0.4) x 10/sup -9/ cm/sup 3/ molecule/sup -3/ sec/sup -1/ with a zero pressure rate of 11.3 +- 1.3 sec/sup -1/. The latter rate sets an upper limit on the spin--orbit relaxation rate. The photodissociation probability varies with laser frequency, exhibiting a broad, structureless peak near 960 cm/sup -1/. The initial photodissociation rate is proportional to laser irradiance k/sub D/ = 0.80 +- 0.08 sec/sup -1//W cm/sup -2/. The photoproducts and laser frequency dependence are the same using either cw or pulsed irradiation. Ions were exposed tomore » irradiances up to 120 W cm/sup -2/ cw and fluences up to 1.6 J cm/sup -2/ pulsed. Ion cyclotron resonance (ICR) techniques were used to store and detect the ions.« less" @default.
- W2275492021 created "2016-06-24" @default.
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- W2275492021 date "1981-05-01" @default.
- W2275492021 modified "2023-09-28" @default.
- W2275492021 title "Efficient multiphoton dissociation of CF/sub 3/I/sup +/ in the metastable X /sup 2/E/sub 1/2/ excited state using cw infrared laser radiation" @default.
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