Dissociation of compound ions in a high electric field: Atomic tunneling, orientational, and isotope effects

Tien T. Tsong, Milton Walter Cole

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Dissociation of compound ions, HeRh2+, has been studied with a combined technique of pulsed-laser-stimulated field desorption and time-of-flight spectroscopy. It is found that HeRh2+4 ions can dissociate in a field of a few V/AI by atomic tunneling several hundred femtoseconds after their formation. This dissociation time is believed to be one of the fastest reaction times ever successfully measured. The tunneling effect is confirmed with a strong isotope effect observed when He4 is replaced with He3. The field dissociation can occur most readily when the ions are rotated by 180°from their original field-desorption orientation. This orientation effect produces a secondary peak in the time-of-flight spectral line of Rh2+. The experimental results can be satisfactorily explained by using a realistic interaction U(r) between a He atom and a Rh2+ ion. This potential is constructed from an effective-medium model of the repulsion, an induced dipole attraction, and damped dispersion interaction terms.

Original languageEnglish (US)
Pages (from-to)66-73
Number of pages8
JournalPhysical Review B
Volume35
Issue number1
DOIs
StatePublished - Jan 1 1987

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Isotopes
isotope effect
Electric fields
dissociation
Ions
electric fields
Desorption
ions
desorption
Pulsed lasers
reaction time
attraction
line spectra
pulsed lasers
interactions
Spectroscopy
dipoles
Atoms
spectroscopy
atoms

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

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Dissociation of compound ions in a high electric field : Atomic tunneling, orientational, and isotope effects. / Tsong, Tien T.; Cole, Milton Walter.

In: Physical Review B, Vol. 35, No. 1, 01.01.1987, p. 66-73.

Research output: Contribution to journalArticle

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AU - Tsong, Tien T.

AU - Cole, Milton Walter

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N2 - Dissociation of compound ions, HeRh2+, has been studied with a combined technique of pulsed-laser-stimulated field desorption and time-of-flight spectroscopy. It is found that HeRh2+4 ions can dissociate in a field of a few V/AI by atomic tunneling several hundred femtoseconds after their formation. This dissociation time is believed to be one of the fastest reaction times ever successfully measured. The tunneling effect is confirmed with a strong isotope effect observed when He4 is replaced with He3. The field dissociation can occur most readily when the ions are rotated by 180°from their original field-desorption orientation. This orientation effect produces a secondary peak in the time-of-flight spectral line of Rh2+. The experimental results can be satisfactorily explained by using a realistic interaction U(r) between a He atom and a Rh2+ ion. This potential is constructed from an effective-medium model of the repulsion, an induced dipole attraction, and damped dispersion interaction terms.

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