Fast beam studies of I2− and I2−·Ar photodissociation

Hoops, Alexandra A.; Gascooke, Jason R.; Faulhaber, Ann Elise; Kautzman, Kathryn E.; Neumark, Daniel M.

doi:10.1016/s0009-2614(03)00708-5

Cited by 28 publications

(30 citation statements)

References 34 publications

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“…For such an event, the two detected fragments corresponding to the outer I atoms were approximately equally displaced from the center of the detector, while the third fragment, corresponding to the central I atom, impacted the beam block. The new detector permits the detection of three photofragments per dissociation event, as was demonstrated in our recent study of I 2 Ϫ •Ar photodissociation, 33 yielding a more complete picture of the three-body decay channel.…”

Section: Methodsmentioning

confidence: 95%

“…The ion beam, mass-spectrometer, and laser interaction components of this instrument 32,34,35 remain unchanged from our earlier study of I 3 Ϫ , 1 but the TPS detector 33 is quite different.…”

Section: Methodsmentioning

confidence: 97%

“…Based on the P(E T ) distribution resulting from the dissociation of O 2 B 3 ⌺ u Ϫ (vЈϭ7), the current translational energy resolution of this arrangement is ⌬E T /E T Ϸ0.7%. 33 The beam block reduces the detection efficiency of those fragments that have low translational energy or values of close to 90°with vertically polarized laser light, while fragments of high translational energy with close to 0°or 180°m iss the detector entirely. These effects are accounted for by normalizing the raw translational energy distributions with a detector acceptance function ͑DAF͒ for decay yielding two fragments.…”

Section: Methodsmentioning

confidence: 99%

“…33 The new design presents several advantages, described in more detail in the following section, over that used in the work of Choi et al 1 In particular, the new detector is not restricted to the detection of only two fragments per laser shot, and charged fragments can be detected directly. These features result in better characterization of both the two-and three-body dissociation channels of I 3 Ϫ .…”

Section: Introductionmentioning

confidence: 99%

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Two- and three-body photodissociation of gas phase I3−

Hoops

Gascooke

Faulhaber

et al. 2004

The Journal of Chemical Physics

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The photodissociation dynamics of I 3 Ϫ from 390 to 290 nm ͑3.18 to 4.28 eV͒ have been investigated using fast beam photofragment translational spectroscopy in which the products are detected and analyzed with coincidence imaging. At photon energies р3.87 eV, two-body dissociation that generates I Ϫ ϩI 2 (A 3 ⌸ 1u ) and vibrationally excited I 2 Ϫ (X 2 ⌺ u ϩ )ϩI( 2 P 3/2 ) is observed, while at energies у3.87 eV, I*( 2 P 1/2 )ϩI 2 Ϫ (X 2 ⌺ u ϩ ) is the primary two-body dissociation channel. In addition, three-body dissociation yielding I Ϫ ϩ2I( 2 P 3/2 ) photofragments is seen throughout the energy range probed; this is the dominant channel at all but the lowest photon energy. Analysis of the three-body dissociation events indicates that this channel results primarily from a synchronous concerted decay mechanism.

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Section: Methodsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Two- and three-body photodissociation of gas phase I3−

Hoops

Gascooke

Faulhaber

et al. 2004

The Journal of Chemical Physics

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“…It should be noted that the data presented in this work were obtained before the recent upgrade to a photofragment coincidence imaging detector. 42 …”

Section: Methodsmentioning

confidence: 99%

Photodissociation dynamics of the HCNN radical

Faulhaber

Gascooke

Hoops

et al. 2006

The Journal of Chemical Physics

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The photodissociation dynamics of the diazomethyl ͑HCNN͒ radical have been studied using fast radical beam photofragment translational spectroscopy. A photofragment yield spectrum was obtained for the range of 25 510-40 820 cm −1 , and photodissociation was shown to occur for energies above 25 600 cm −1 . The only product channel observed was the formation of CH and N 2 . Fragment translational energy and angular distributions were obtained at several energies in the range covered by the photofragment yield spectrum. The fragment translational energy distributions showed at least two distinct features at energies up to 4.59 eV, and were not well fit by phase space theory at any of the excitation energies studied. A revised C-N bond dissociation energy and heat of formation for HCNN, D 0 ͑HC-NN͒ = 1.139± 0.019 eV and ⌬ f H 0 ͑HCNN͒ = 5.010± 0.023 eV, were determined.

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Global Minimum‐Energy Structure and Spectroscopic Properties of I₂^.−⋅n H₂O Clusters: A Monte Carlo Simulated Annealing Study

2010

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The vibrational (IR and Raman) and photoelectron spectral properties of hydrated iodine-dimer radical-anion clusters, I(2)(*-) x n H(2)O (n=1-10), are presented. Several initial guess structures are considered for each size of cluster to locate the global minimum-energy structure by applying a Monte Carlo simulated annealing procedure including spin-orbit interaction. In the Raman spectrum, hydration reduces the intensity of the I-I stretching band but enhances the intensity of the O-H stretching band of water. Raman spectra of more highly hydrated clusters appear to be simpler than the corresponding IR spectra. Vibrational bands due to simultaneous stretching vibrations of O-H bonds in a cyclic water network are observed for I(2)(*-) x n H(2)O clusters with n > or = 3. The vertical detachment energy (VDE) profile shows stepwise saturation that indicates closing of the geometrical shell in the hydrated clusters on addition of every four water molecules. The calculated VDE of finite-size small hydrated clusters is extrapolated to evaluate the bulk VDE value of I(2)(*-) in aqueous solution as 7.6 eV at the CCSD(T) level of theory. Structure and spectroscopic properties of these hydrated clusters are compared with those of hydrated clusters of Cl(2)(*-) and Br(2)(*-).

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Fast beam studies of I2− and I2−·Ar photodissociation

Abstract: The photodissociation dynamics of bare I

Cited by 28 publications

References 34 publications

Two- and three-body photodissociation of gas phase I3−

Two- and three-body photodissociation of gas phase I3−

Photodissociation dynamics of the HCNN radical

Global Minimum‐Energy Structure and Spectroscopic Properties of I₂^.−⋅n H₂O Clusters: A Monte Carlo Simulated Annealing Study

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Fast beam studies of I2− and I2−·Ar photodissociation

Abstract: The photodissociation dynamics of bare I

Cited by 28 publications

References 34 publications

Two- and three-body photodissociation of gas phase I3−

Two- and three-body photodissociation of gas phase I3−

Photodissociation dynamics of the HCNN radical

Global Minimum‐Energy Structure and Spectroscopic Properties of I2.−⋅n H2O Clusters: A Monte Carlo Simulated Annealing Study

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Product

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Global Minimum‐Energy Structure and Spectroscopic Properties of I₂^.−⋅n H₂O Clusters: A Monte Carlo Simulated Annealing Study