Threshold ion photodissociation. Bromobenzene and iodobenzene ions

Dunbar, Robert C.; Honovich, Jeffrey P.

doi:10.1016/0168-1176(84)80018-x

Cited by 24 publications

(13 citation statements)

References 18 publications

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“…Dunbar and Honovich showed that one-photon behavior could occur if a small fraction of onephoton ions together with two-photon species were present in the threshold region. 17 The photofragment kinetic energy is the other uncertainty in the course of complex dissociation, with consideration of the kinetic shift resulting in the true onset appearing shifted towards the red. In a survey of previous studies using the same experimental strategy as employed here, photodissociation performed on the Ag þ -benzene complex by Duncan et al resulted in an upper binding energy of 30 kcal mol À1 , 18 6.5 kcal mol À1 less than the theoretical prediction.…”

Section: Resultsmentioning

confidence: 99%

Photodissociation and theoretical studies of the Au+–(C5H5N) complex

et al. 2002

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Laser vaporization combined with a supersonic molecular beam was employed to generate and study the Au(C 5 H 5 N) þ complex for the first time. On the basis of the ionization energies (IE) between gold and pyridine, the Au(C 5 H 5 N) þ species is viewed as being a Au þ -C 5 H 5 N species. Photodissociative charge transfer was observed with exclusive C 5 H 5 N þ (pyridine) formation. The photofragmentation spectrum of Au þ -(C 5 H 5 N) was scanned by monitoring the pyridine fragments. A structureless continuum spectrum was observed and the onset of C 5 H 5 N þ appearance indicates the upper limit on the Au þ -C 5 H 5 N bond strength to be 59.6 kcal mol À1 . Ab initio calculations at the MP2 level were employed to optimize the geometries of the gold complexes and binding energies were obtained using CCSD(T) single point calculations. Besides from the C 2v structure observed in Cu þ and Ag þ complexes, the theoretical results yielded a second isomer with C 1 symmetry which is 24 kcal mol À1 less stable in energy than the C 2v isomer.

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Section: Resultsmentioning

confidence: 99%

Photodissociation and theoretical studies of the Au+–(C5H5N) complex

et al. 2002

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“…Dunbar and coworkers have reported a threshold of 2.81 f 0.07 eV (440 f 10 nm) for this reaction (22).…”

Section: Resultsmentioning

confidence: 84%

Consecutive laser-induced photodissociation as a probe of ion structure

Bowers¹,

Delbert²,

McIver³

1986

Anal. Chem.

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“…v the one -p hoton threshold, id en tification of the one-photon threshold depends on identifying the wavelength of transition from two-photon to oneph ot on characteris tics . This was successfully carried out in the case of halobenzene ion dissociations to yield very precise thermochemistry [18]. In the present case , it was not possible to achieve a wavelength short enough to give one-photon behavior, but by characterizing the PD behavior at the shortest available wavelengths it was possible to set a confident lower limit on the one-photon threshold energy.…”

Section: Ultraviolet Measurements and The Dissociation Thresholdmentioning

confidence: 95%

Photodissociation spectroscopy of gas-phase ferrocene cation

Faulk

Dunbar

1991

J. Am. Soc. Mass Spectrom.

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The optical absorption spectrum of gas-phase ferrocene cation was measured by photodissociation (PO) spectroscopy between 570 nm and 643 nm. The PO process was loss of a cyclopentadienyl ring from the parent cation. Some structure was observed in the PO spectrum, with the highest PO being at 603 nm. The peak spacing did not correspond to a vibrational progression in the expected totally symmetric vibrational mode, and a possible assignment of the three apparent maxima involving electronic transitions from low-lying electronic states is proposed. Information on the dissociation threshold was sought by light intensity dependence measurements at 308 nm, 266 nm, and time-resolved PD measurements at 308 nrn, 266 nrn, and 240 nm. The PD at all of these wavelengths showed two-photon characteristics, indicating that the threshold for observable one-photon PO lies higher than about 5.4 eV.

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Threshold ion photodissociation. Bromobenzene and iodobenzene ions

Cited by 24 publications

References 18 publications

Photodissociation and theoretical studies of the Au+–(C5H5N) complex

Photodissociation and theoretical studies of the Au+–(C5H5N) complex

Consecutive laser-induced photodissociation as a probe of ion structure

Photodissociation spectroscopy of gas-phase ferrocene cation

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