Dissociation dynamics of fast neutral H2 beams incident at glancing angles to Cu(111)

Harder, R.; Nesbitt, A.; Herrmann, G.; Tellioglu, K.; Rechtien, J.H.; Snowdon, K.J.

doi:10.1016/0039-6028(94)91128-2

Cited by 19 publications

(26 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, swift projectiles, incident at glancing angles, can experience nonadiabatic electronic transitions more readily than can slow projectiles directed along the surface normal. 39 Hence, the ion yields associated with this study are not unreasonably low. 3,6 At a collision energy of 50 eV we measured how the negative-ion product yields depend on the incident OCS ϩ spin-orbit state and the initial number of vibrational quanta.…”

Section: Resultsmentioning

confidence: 70%

Dynamics of dissociative scattering: Hyperthermal energy collisions of state-selected OCS+ on Ag(111)

Morris

Kim

Barstis

et al. 1997

The Journal of Chemical Physics

View full text Add to dashboard Cite

Articles you may be interested inDynamics of the dissociative and nondissociative scattering of hyperthermal CS 2 + from a self-assembled fluoroalkyl monolayer surface on gold substrate Surface induced dissociations of protonated ethanol monomer, dimer and trimer ions: Trimer break-down graph from the collision energy dependence of projectile fragmentation Fragmentation and ion-scattering in the low-energy collisions of small silver cluster ions ( Ag n + :n=1−4) with a highly oriented pyrolytic graphite surfaceThe dynamics of dissociation and negative ion formation have been investigated for the hyperthermal energy scattering of state-selected OCS ϩ (X 2 ⌸ x , 1 , 2 , 3 ) on Ag͑111͒. Experiments reveal the effect that collision energy and internal energy have on the formation of scattered ionic products. An analysis of the appearance threshold and fragment velocity distribution for each scattered product channel ͓S Ϫ ( 2 P), O Ϫ ( 2 P), and SO Ϫ (X 2 ⌸)] suggests that three distinct fragmentation mechanisms compete. Prompt impulsive dissociation of neutralized OCS ϩ (X 2 ⌸), followed by electron attachment to the nascent O fragment, is responsible for O Ϫ ( 2 P) emergence. The production of SO Ϫ (X 2 ⌸) relies on a collisionally activated distortion of OCS, forcing the O and S atoms close together while ejecting the central carbon atom. Finally, a comparison between the scattering of state-selected OCS ϩ (X 2 ⌸ x , 1 , 2 , 3 ) and S ϩ ( 4 S) on Ag͑111͒ provides strong evidence that dissociative neutralization of OCS ϩ (X 2 ⌸ x , 1 , 2 , 3 ) leads to S Ϫ ( 2 P) fragments. A discussion of time scales for the various dissociation mechanisms is presented.

show abstract

Section: Resultsmentioning

confidence: 70%

Dynamics of dissociative scattering: Hyperthermal energy collisions of state-selected OCS+ on Ag(111)

Morris

Kim

Barstis

et al. 1997

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…To our knowledge, for the barrier height of the system under investigation, there is no experimental or theoretical data available. Thus, we just assume a mixing parameter as in 25 V 12 ϭ ͑12͒…”

Section: ͑10͒mentioning

confidence: 99%

Scattering of fast N2 from Pd(111): A classical trajectory study

Schlathölter

Vicanek

et al. 1997

The Journal of Chemical Physics

View full text Add to dashboard Cite

Molecular nitrogen is well known for its chemical inactivity. Experimental results for grazing incidence N 2 scattering from Pd͑111͒ surfaces in the keV range also reveal negligible influences of electronical processes on molecular fragmentation. Therefore, we carry out an appropriate classical treatment of this system. The N 2-Pd͑111͒ interaction is mediated by an analytical six-dimensional potential energy surface, based on ab initio density-functional-theory calculations and empirical data. The molecule-surface interaction seems to be strongly influenced by the azimuthal direction of incidence as well as the molecular axis orientation. Particularly, the fragmentation is found to be mainly due to vibrational excitation for highly indexed azimuthal directions, whereas for incidence along lowly indexed directions rotational excitation is more important.

show abstract

“…The probability distribution as functions of the released kinetic energy and the molecular orientation with respect to the surface normal is experimentally reported by Harder et al 13,16 In the experiment, hydrogen molecules with the high translational energy ͑500 eV-1000 eV͒ are scattered from metal substrate. The numerical result is shown as functions of the released kinetic energy and the molecular orientation with respect to the surface normal in Fig.…”

Section: Comparison Of the Experimental And Numerical Resultsmentioning

confidence: 91%

“…In addition, a good account of the experimental results can be given for the probability distribution as functions of the released kinetic energy and the molecular orientation with respect to the surface normal. 13,16 II. MODEL…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10] On the other hand, in the range of translational energies of a few hundred eV , it was found experimentally that hydrogen molecules can be scattered dissociatively by metal surfaces. [11][12][13][14][15][16][17][18][19] In this high energy range, it is considered that the dissociation of the molecule is induced by an excitation of electron system in the molecule. 13,19 The excitation involves electron transitions from the bonding state of the molecule to the metal substrate and from the metal substrate to the antibonding state of the molecule, i.e., the dissociation of the impinging molecule is dominated by the electron transition between the impinging molecule and the metal substrate.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Orientation dependence in the dissociative scattering of hydrogen molecules from metal surfaces: Interference of electron waves in the scattering process

et al. 2000

View full text Add to dashboard Cite

The molecular orientation dependence of the dissociation probability of hydrogen molecules scattered from metal surfaces is investigated. It is assumed that the dissociation of the molecule is induced by an excitation of electron system in the molecule, involving electron transitions from the bonding state of the molecule to the metal substrate and from the metal substrate to the antibonding state of the molecule. The probability distributions are calculated as functions of the released kinetic energy and the final translational energy of the molecule in the cases when the impinging molecule has various orientations. On the basis of the numerical results, it is found that the orientation dependence of the probability distribution appears as a consequence of the self-interference of electron waves transferring between the impinging molecule and the metal substrate. In addition, a good account of the experimental results can be given for the probability distribution as functions of the released kinetic energy and the molecular orientation with respect to the surface normal.

show abstract

Dissociation dynamics of fast neutral H2 beams incident at glancing angles to Cu(111)

Cited by 19 publications

References 71 publications

Dynamics of dissociative scattering: Hyperthermal energy collisions of state-selected OCS+ on Ag(111)

Dynamics of dissociative scattering: Hyperthermal energy collisions of state-selected OCS+ on Ag(111)

Scattering of fast N2 from Pd(111): A classical trajectory study

Orientation dependence in the dissociative scattering of hydrogen molecules from metal surfaces: Interference of electron waves in the scattering process

Contact Info

Product

Resources

About