The interaction of O2, NO, and N2O with Ge surfaces

Entringer, Anthony G.; Shinar, Ruth; Shanks, H. R.

doi:10.1016/0039-6028(90)90555-m

Cited by 13 publications

(9 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This also corresponds well with the IR spectrum of GeO 2 . In addition to these two peaks, there is a very low-frequency mode at 264 cm -1 in the spectrum of adsorbed oxygen, which is bridge-bonded between two germanium atoms . This is due to the rocking mode of the Ge−O−Ge.…”

Section: Resultssupporting

confidence: 80%

See 1 more Smart Citation

Chemistry of HNO₃ on Ge(100)

1998

View full text Add to dashboard Cite

We describe here the initial bonding geometry and decomposition mechanism of HNO3 on Ge(100). A combination of high-resolution electron energy loss spectroscopy, Auger electron spectroscopy, and temperature programmed desorption experiments have been used to shed light on the details of this complex but technologically important system. It was found that HNO3 adsorbs molecularly at 190 K in a predominantly bidentate bonding configuration. When the substrate is warmed to 425 K, the molecule decomposes. In a process that involves two adjacent HNO3 adsorbates, H2O and NO desorb while O remains on the surface. Further heating above 600 K causes the O to desorb as GeO.

show abstract

Section: Resultssupporting

confidence: 80%

“…The strong peak initially at 890 cm -1 has also shifted its position slightly to 860 cm -1 . These two peaks seen in the spectrum at 860 and 500 cm -1 after the sample was warmed to 500 K are due to the antisymmetric stretch and bending modes, respectively, of bridge-bonded oxygen . This also corresponds well with the IR spectrum of GeO 2 .…”

Section: Resultssupporting

confidence: 71%

Chemistry of HNO₃ on Ge(100)

1998

View full text Add to dashboard Cite

show abstract

“…These peaks were assigned to the rocking ( ), bending (7), and asymmetric stretching (vas) modes of the Ge-O-Ge group, respectively, and suggest that oxygen chemisorbs dissociatively in the bridge configuration. 18 The frequency of the vas(GeOGe) mode shifts from 790 cnr1 at 10 L to 860 cm-1 at 104 L. This upward shift with increasing exposure is attributed to an increase in the average bond angle of the Ge-O-Ge bridges. 18 Vibrational Spectra of Hydrogenated Amorphous Ge and Ge-Si Alloys.…”

Section: Discussionmentioning

confidence: 95%

“…18 The frequency of the vas(GeOGe) mode shifts from 790 cnr1 at 10 L to 860 cm-1 at 104 L. This upward shift with increasing exposure is attributed to an increase in the average bond angle of the Ge-O-Ge bridges. 18 Vibrational Spectra of Hydrogenated Amorphous Ge and Ge-Si Alloys. The infrared and Raman spectra of a-Ge:H films made by plasma decomposition of germane and reactive sputtering of Ge have three groups of structures.22"28•35•36 They correspond to stretching vibrations of GeH* at 1880-2060 cm-1, deforma tional vibrations of GeH2 and GeH3 at 750-830 cm-1, and bending vibrations at about 570 cm"1.…”

Section: Discussionmentioning

confidence: 95%

Comparative study of evaporated germanium and silicon films by inelastic electron tunneling spectroscopy

Higo¹,

Isobata²,

Kamata³

1993

J. Phys. Chem.

View full text Add to dashboard Cite

“…The interactions of N 2 O with Ge ͑111͒, disordered Ge ͑111͒, and amorphous Ge surfaces were studied near 300 K using high-resolution electron energy-loss spectroscopy ͑EELS͒, core-level and valence-band EELS, and Auger electron spectroscopy. 10 From these investigations, N 2 O molecules were found to decompose into desorbing N 2 molecules and chemisorbed oxygen atoms.…”

Section: Introductionmentioning

confidence: 99%

Infrared absorption of GeNNO isolated in solid Ar

Jiang

Glatthaar

Lee

2009

The Journal of Chemical Physics

View full text Add to dashboard Cite

Codeposition of thermally generated atomic germanium vapor and nitrous oxide (N(2)O) in Ar onto a substrate at 11 K produced infrared absorption lines in several sets. The most prominent comprises intense lines at 1443.7, 1102.4, and 784.0 cm(-1) that become diminished upon irradiation with UV or visible light. These lines are attributed to nu(1) (NO stretching), nu(2) (NN+GeN stretching), and nu(3) (NNO bending+NN stretching) modes of singlet GeNNO. Two additional weak features at 1238.1 and 2859.2 cm(-1) are assigned as nu(3)+nu(4) and 2nu(1) of GeNNO, respectively. Weak doublet features at 1259.3/1255.5 and 1488.9/1486.4 cm(-1) are tentatively assigned to nu(2) of triplet GeONN and nu(1) of singlet cyc-Ge-eta(2) [NN(O)], respectively. Quantum-chemical calculations on the Ge+N(2)O system with density-functional theory (B3LYP /aug-cc-pVTZ) predict five stable structures: GeNNO (singlet and triplet), singlet cyc-Ge-eta(2) [NN(O)], triplet cyc-Ge-eta(2) (NNO), GeONN (singlet and triplet), and singlet GeNON. Vibrational wavenumbers, relative IR intensities, and (15)N-isotopic ratios for observed species are consistent with those computed. Irradiation of singlet GeNNO with lambda=248 or 193 nm or lambda>525 nm yields GeO.

show abstract

The interaction of O2, NO, and N2O with Ge surfaces

Cited by 13 publications

References 25 publications

Chemistry of HNO₃ on Ge(100)

Chemistry of HNO₃ on Ge(100)

Comparative study of evaporated germanium and silicon films by inelastic electron tunneling spectroscopy

Infrared absorption of GeNNO isolated in solid Ar

Contact Info

Product

Resources

About

The interaction of O2, NO, and N2O with Ge surfaces

Cited by 13 publications

References 25 publications

Chemistry of HNO3 on Ge(100)

Chemistry of HNO3 on Ge(100)

Comparative study of evaporated germanium and silicon films by inelastic electron tunneling spectroscopy

Infrared absorption of GeNNO isolated in solid Ar

Contact Info

Product

Resources

About

Chemistry of HNO₃ on Ge(100)

Chemistry of HNO₃ on Ge(100)