Multiphoton ionization vibrational state selection of H2O+, D2O+ and HDO+

Uselman, Brady W.; Boyle, Jason M.; Anderson, Scott L.

doi:10.1016/j.cplett.2007.04.030

Cited by 16 publications

(19 citation statements)

References 28 publications

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“…This is not particularly surprisingreflecting (i) the relative efficiency of the kick-out mechanism for forming H 2 O(v = 0) molecules and (ii) the (relative) stability of the resonance enhancing C(000) level with respect to predissociation. 53,54 The observation of fragment ions, with a different spectral signature to that of the H 2 O(v = 0) molecules, could be due to REMPI of H 2 O(v*) molecules rather than direct ionization of neutral H or OH fragments.…”

Section: Experimental Detectionmentioning

confidence: 99%

A theoretical and experimental study on translational and internal energies of H2O and OH from the 157 nm irradiation of amorphous solid water at 90 K

Andersson

Arasa

Yabushita

et al. 2011

Phys. Chem. Chem. Phys.

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The photodesorption of H(2)O in its vibrational ground state, and of OH radicals in their ground and first excited vibrational states, following 157 nm photoexcitation of amorphous solid water has been studied using molecular dynamics simulations and detected experimentally by resonance-enhanced multiphoton ionization techniques. There is good agreement between the simulated and measured energy distributions. In addition, signals of H(+) and OH(+) were detected in the experiments. These are inferred to originate from vibrationally excited H(2)O molecules that are ejected from the surface by two distinct mechanisms: a direct desorption mechanism and desorption induced by secondary recombination of photoproducts at the ice surface. This is the first reported experimental evidence of photodesorption of vibrationally excited H(2)O molecules from water ice.

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Section: Experimental Detectionmentioning

confidence: 99%

A theoretical and experimental study on translational and internal energies of H2O and OH from the 157 nm irradiation of amorphous solid water at 90 K

Andersson

Arasa

Yabushita

et al. 2011

Phys. Chem. Chem. Phys.

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“…1,3,4,6 REMPI spectroscopy of water has proved to be an invaluable method in several areas of research, including the general investigation of predissociation in water Rydberg states, [1][2][3][4]6,11 the analysis of water photoejected from ice surfaces, 12 and for preparing state selected H 2 O + molecular ions. 5 Fast predissociation is observed as broadening in the transition linewidth of rotationally resolved REMPI spectra of the three water isotopomers, i.e. H 2 O, HOD and D 2 O.…”

Section: Rempi Studies Of Predissociation Of Rydberg States Of Watermentioning

confidence: 99%

“…Spectroscopic parameters for the simulation of the water REMPI spectrum are available for H 2 O and D 2 O, but not for HOD, although vibrationally resolved REMPI spectra for HOD by Anderson and co-workers, and an action spectrum of the HOD C ˜-X ˜origin band for dissociation to the D + OH fragments by Cheng et al have been reported in recent studies. 5,6 Our goal here is to provide rotational parameters for all three isotopomers that can be used in a standard simulation program (PGOPHER) to evaluate, for example, rotational state populations.…”

Section: Introductionmentioning

confidence: 99%

REMPI spectroscopy and predissociation of the C̃1B1(v = 0) rotational levels of H2O, HOD and D2O

Yang

Sarma

Meulen

et al. 2010

Phys. Chem. Chem. Phys.

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Rotational analysis of the (2 + 1) resonance enhanced multiphoton ionization (REMPI) spectrum of the C(1)B(1) Rydberg state of the water isotopomers H(2)O, HOD and D(2)O is reported. Spectroscopic parameters for the v = 0 vibrational level of the C(1)B(1) state of the mixed isotopomer HOD are derived and its spectra are accurately simulated for the first time using the PGOPHER program. Simulation of two photon spectra of the C(1)B(1)-X(1)A(1) transition of HOD requires two transition moments, and the ratio of these is determined and explained by a simple geometrical model. Optimal transitions for state-selective detection of low energy rotational states are identified for all three molecules. Analysis of the linewidths in the present work, combined with previous work [H. H. Kuge and K. Kleinermanns, J. Chem. Phys., 1989, 90, 46-52; K. J. Yuan et al., Proc. Natl. Acad. Sci. U. S. A., 2008, 105, 19148-19153; M. N. R. Ashfold et al., Chem. Phys., 1984, 84, 35-50; G. Meijer et al., J. Chem. Phys., 1986, 85, 6914-6922.], suggests that while a simple ⟨J(a)'(2)〉-dependent model for heterogeneous predissociation of the C(1)B(1) Rydberg state accounts for much of the quantum number dependence, it is not sufficient for describing the predissociation in any of the three isotopomers. The component of the linewidth due to the homogeneous predissociation attributed to predissociation of the C(1)B(1) by the Ã(1)B(1) state was found to be significantly narrower than in previous work, indicating a longer lifetime of the C(1)B(1) Rydberg state. The current work provides the basis for on-going studies of rotational energy transfer in the mixed isotopomers of water using the velocity map imaging technique.

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“…The simulations only included the origin band of the C − X transition and gave a reasonably good fit to the spectra. Relatively little information is available on vibrationally excited states of the C state, 25 but given the similar geometry of the Rydberg and ground states of water, we would expect any vibrationally excited states to give the strongest spectra in the same region as the origin band. The good fit to ground state only spectra suggests little vibrational excitation in the H 2 O and D 2 O products, though we note that Uselman et al 25 suggested an increasing degree of predissociation for higher C state vibrational states, which would make the states harder to detect for increasing vibrational energy, and our detection method is probably completely insensitive to molecules with a large degree of vibrational or rotational excitation.…”

Section: B Simulation Of 2 + 1 Rempi Spectra Of Water Moleculesmentioning

confidence: 99%

A desorption mechanism of water following vacuum-ultraviolet irradiation on amorphous solid water at 90 K

Hama

Yokoyama

Yabushita³

et al. 2010

The Journal of Chemical Physics

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Following 157 nm photoexcitation of amorphous solid water and polycrystalline water ice, photodesorbed water molecules (H(2)O and D(2)O), in the ground vibrational state, have been observed using resonance-enhanced multiphoton ionization detection methods. Time-of-flight and rotationally resolved spectra of the photodesorbed water molecules were measured, and the kinetic and internal energy distributions were obtained. The measured energy distributions are in good accord with those predicted by classical molecular dynamics calculations for the kick-out mechanism of a water molecule from the ice surface by a hot hydrogen (deuterium) atom formed by photodissociation of a neighboring water molecule. Desorption of D(2)O following 193 nm photoirradiation of a D(2)O/H(2)S mixed ice was also investigated to provide further direct evidence for the operation of a kick-out mechanism.

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Multiphoton ionization vibrational state selection of H2O+, D2O+ and HDO+

Cited by 16 publications

References 28 publications

A theoretical and experimental study on translational and internal energies of H2O and OH from the 157 nm irradiation of amorphous solid water at 90 K

A theoretical and experimental study on translational and internal energies of H2O and OH from the 157 nm irradiation of amorphous solid water at 90 K

REMPI spectroscopy and predissociation of the C̃1B1(v = 0) rotational levels of H2O, HOD and D2O

A desorption mechanism of water following vacuum-ultraviolet irradiation on amorphous solid water at 90 K

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