Photoionization studies of GeH sub n ( n =2--4)
- Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439 (US)
The adiabatic ionization potential of GeH{sup +}{sub 4} (GeH{sub 4}) is measured by photoionization mass spectrometry to be {le}10.53 eV and perhaps as low as 10.44 eV. This is about 0.8 eV ({similar to}9 vibrational quanta) lower than the value reported by photoelectron spectroscopy. This result, analogous to that found for SiH{sup +}{sub 4} (SiH{sub 4}), implies a marked Jahn--Teller distortion of GeH{sup +}{sub 4}. The appearance potentials of GeH{sup +}{sub 2} and GeH{sup +}{sub 3} from GeH{sub 4} are {le}10.77{sub 2}{plus minus}0.009 eV and {lt}11.65{sub 7}{plus minus}0.01 eV, respectively. The reaction of F atoms with GeH{sub 4} generates GeH{sub 3}, GeH{sub 2} (weakly), and some atomic germanium. The adiabatic ionization potential of GeH{sub 3} is {le}7.94{sub 8}{plus minus}0.005 eV; that of GeH{sub 2} is {le}9.25 eV. Together with auxiliary information, limits (more probable values) of the incremental bond energies, in kcal/mol, are found to be {ital D}{sub 0} (H{sub 3}Ge--H) {lt}85.5 (82{plus minus}2); {ital D}{sub 0} (H{sub 2}Ge--H) {gt}56.4 (59); {ital D}{sub 0} (HGe--H) {lt}68.9 (66); and {ital D}{sub 0} (Ge--H) {gt}53.7 (63). These specific bond energies, when appropriately normalized, display the same pattern as the SiH{sub {ital n}} (but not the CH{sub {ital n}}) bond energies and provide a basis for estimating the corresponding SnH{sub {ital n}} bond energies.
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 7003584
- Journal Information:
- Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 92:3; ISSN JCPSA; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
CHEMICAL BONDS
DISSOCIATION HEAT
ELECTRON SPECTROSCOPY
ENTHALPY
GERMANIUM COMPOUNDS
GERMANIUM HYDRIDES
HYDRIDES
HYDROGEN COMPOUNDS
IONIZATION
IONIZATION POTENTIAL
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
PHYSICAL PROPERTIES
REACTION HEAT
SPECTROSCOPY
THERMODYNAMIC PROPERTIES