Internal quantum state distributions of NH3 photodesorbed from Cu(111) at 6.4 eV

Nessler, Winfried; Bornscheuer, Karl-Heinz; Hertel, Tobias; Hasselbrink, Eckart

doi:10.1016/0301-0104(95)00382-7

Cited by 29 publications

(16 citation statements)

References 44 publications

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“…Some results for NH 3 have recently been published [11]. For the first time, we observe a marked isotope-dependent disparity of the population in the symmetry states in the n 2 mode.…”

Section: Isotope and Quantum Effects In Vibrational State Distributiomentioning

confidence: 83%

“…Most experimental details have been discussed in a recent publication [11]. A pulsed excimer laser (193 nm, 17 ns) is used to illuminate an area of 6 3 8 mm ͑pulse fluence , 8 mJ͞cm 2 ͒ on the Cu surface.…”

Section: Isotope and Quantum Effects In Vibrational State Distributiomentioning

confidence: 99%

“…State resolved detection of desorbed molecules and isotopic substitution of adsorbates are powerful tools in unraveling the details of the microscopic events leading eventually to photodesorption [3][4][5][6][7][8]. The photodesorption of ammonia has been proven to be a system rich in detail, since the desorption dynamics follows a path which is multidimensional in canonical coordinates [9][10][11]. Ammonia is believed to adsorb in atop sites with the N atom bound to the surface and an only slightly perturbed pyramidal internal geometry [12].…”

Section: Isotope and Quantum Effects In Vibrational State Distributiomentioning

confidence: 99%

“…Ammonia is dosed between desorption laser pulses using a pulsed nozzle. The apparatus allows a dye laser beam to be aligned close (2.5 mm) to the sample [11]. 2 1 1 photon resonance enhanced multiphoton ionization (REMPI) via theB 1 E 00 state of ammonia is used to detect photodesorbed ammonia molecules in a state specific manner [18].…”

Section: Isotope and Quantum Effects In Vibrational State Distributiomentioning

confidence: 99%

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Isotope and Quantum Effects in Vibrational State Distributions of Photodesorbed Ammonia

et al. 1997

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A marked quantum effect has been observed in the vibrational state distribution of photodesorbed ammonia. Namely, for quantum numbers larger than zero, symmetric and antisymmetric levels in the n 2 mode of the desorbed ammonia molecule are unequally populated. A strong propensity for symmetric levels is observed for NH 3 , whereas the reverse is found for ND 3 . Model calculations reproduce this effect. Moreover, it is found that the actual ratios probe the binding energy in the energetically less favorable inverted geometry with the H atoms pointing towards the surface. [S0031-9007(97)

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“…Some results for NH 3 have recently been published [11]. For the first time, we observe a marked isotope-dependent disparity of the population in the symmetry states in the n 2 mode.…”

Section: Isotope and Quantum Effects In Vibrational State Distributiomentioning

confidence: 83%

Section: Isotope and Quantum Effects In Vibrational State Distributiomentioning

confidence: 99%

Section: Isotope and Quantum Effects In Vibrational State Distributiomentioning

confidence: 99%

Section: Isotope and Quantum Effects In Vibrational State Distributiomentioning

confidence: 99%

See 2 more Smart Citations

Isotope and Quantum Effects in Vibrational State Distributions of Photodesorbed Ammonia

et al. 1997

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“…The rest of the experimental procedures is straight-forward: A home-built UHV apparatus with a base pressure of 5 Â 10 À10 mbar was used to perform the experiments [28]. The sample was held by a lq.…”

Section: Methodsmentioning

confidence: 99%

Photochemistry on ultrathin metal films

Hasselbrink¹

2008

Surface Science

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The Rotational State Distributions of Photodesorbed Ammonia as a Local Probe of Corrugation

Bornscheuer¹,

Binetti²,

Hasselbrink³

1998

Israel Journal of Chemistry

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Abstract. Photodesorption of ammonia follows a curved reaction path. Electronic excitation of, or electron attachment to, the adsorbate molecule leads to a transition from the pyramidal ground state to an excited state with planar geometry. During the short residence time in the excited state, the hydrogen atoms are accelerated towards the surface, resulting in an inversion of the molecule and a strong repulsion from the surface which eventually leads to desorption. In this paper, we present evidence that in the inverted geometry the molecule feels the corrugation of the surface potential on rotation around its symmetry axis. This gives rise to a strong torque in cases where the 3-fold symmetry of the molecule is not matched by the lattice symmetry, resulting in energy transfer to the rotational degrees of freedom. Secondly, it is demonstrated that when both ammonia and oxygen are coadsorbed on a Ru surface, in which case the rotation of adsorbed NH, is frustrated, a large fraction of the zero point energy is released as rotational energy.

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Internal quantum state distributions of NH3 photodesorbed from Cu(111) at 6.4 eV

Cited by 29 publications

References 44 publications

Isotope and Quantum Effects in Vibrational State Distributions of Photodesorbed Ammonia

Isotope and Quantum Effects in Vibrational State Distributions of Photodesorbed Ammonia

Photochemistry on ultrathin metal films

The Rotational State Distributions of Photodesorbed Ammonia as a Local Probe of Corrugation

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