Hydrogen Complexes and their Vibrations in Proton and Deuteron Implanted Inp: Theory and Experiment

1992 ◽  
Vol 291 ◽  
Author(s):  
D. N. Talwar ◽  
D. W. Fischer ◽  
M. O. Manasreh ◽  
G. Matous
Keyword(s):  
Nearest Neighbor ◽  
Vibrational Mode ◽  
The Other ◽  
Absorption Lines ◽  
Infrared Absorption Spectroscopy ◽  
Annealing Behavior ◽  
Local Vibrational Mode ◽  
Stretching Vibration ◽  
Mev Protons ◽  
Theory And Experiment

ABSTRACTBy using a Van de Graaff accelerator we have implanted 2 MeV protons and deuterons into InP samples. These implanted samples were annealed in 50 °C increments in the 200 to 600 °C temperature range for 30 minutes each and then measured by the infrared absorption spectroscopy. A group of four different local vibrational mode absorption lines is observed, each of which arises from the hydrogen-phosphorus stretching vibration with different defects or impurities at nearest-neighbor sites. Each mode exhibits an annealing behavior which is different than any of the other absorption lines. The annealing results are shown and discussed in terms of Green's function calculations of the defects responsible for the two absorption lines.

Plasma Oxidation Process of Silicon Surfaces Investigated by Infrared Spectroscopy

2005 ◽  
Vol 8 (1) ◽  
Author(s):  
Masanori Shinohara ◽  
Teruaki Katagiri ◽  
Keitaro Iwatsuji ◽  
Yoshinobu Matsuda ◽  
Yasuo Kimura ◽  
...  
Keyword(s):  
Oxygen Plasma ◽  
Oxidation Process ◽  
The Other ◽  
Silicon Surfaces ◽  
Infrared Absorption Spectroscopy ◽  
Oxygen Species ◽  
Plasma Oxidation ◽  
Oxidation Processes ◽  
Surface Hydrogen ◽  
Stretching Vibration

AbstractPlasma oxidation processes of hydrogen-terminated Si(100), (110), and (111) surfaces are investigated by infrared absorption spectroscopy (IRAS) in multiple internal reflection (MIR) geometry. We measured IRAS spectra of hydrogen-terminated Si surfaces exposed to oxygen-plasma in the Si-H stretching vibration region. IRAS data demonstrated that oxygen-plasma affects two influences on the Si surfaces; one is that oxygen-plasma removes surface hydrogen to oxidize the Si surfaces. The other is that it forces the hydrogen into the subsurface regions where oxygen species cannot reach. The former effect does not depend on the crystal graphic orientations, but the latter depends on it. Therefore, in order to oxidize perfectly the H-terminated Si surfaces using oxygen-plasma, the sample surfaces need to be heated so that oxygen atoms can diffuse into the subsurface regions.

Interactions Between Hydrogen and Silicon Acceptors in p-Type GaAs:Si

1987 ◽  
Vol 104 ◽  
Author(s):  
J. Chevallier ◽  
B. Pajot ◽  
A. Jalil ◽  
R. Mostefaoui ◽  
R. Rahbi ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Infrared Absorption ◽  
Vibrational Mode ◽  
Microscopic Model ◽  
Infrared Absorption Spectroscopy ◽  
Acceptor Concentration ◽  
Local Vibrational Mode ◽  
Deuterium Concentration ◽  
Sims Analysis ◽  
P Type

ABSTRACTWe show that silicon acceptors can be neutralized in p-type GaAs: Si. SIMS analysis shows that the deuterium concentration closely follows the net acceptor concentration. Infrared absorption spectroscopy reveals lines at 2094.7cm-1 and 1514.5cm-1 in hydrogenated and deuterated samples respectively. The ratio r of the two frequencies is 1.383 indicating that the lines are related to hydrogen isotopes. The reduction of the intensity of the local vibrational mode (LVM) of SiAs after neutralization is consistent with the formation of SiAs-H bonds. From SIMS data, it is concluded that most of the hydrogen present in the passivated material is complexed with silicon. A microscopic model of the Si-H complex is proposed.

Divacancy-Oxygen and Trivacancy-Oxygen Complexes in Silicon: Local Vibrational Mode Studies

2009 ◽  
Vol 156-158 ◽  
pp. 129-134 ◽  
Author(s):  
L.I. Murin ◽  
Bengt Gunnar Svensson ◽  
J. Lennart Lindström ◽  
Vladimir P. Markevich ◽  
Charalamos A. Londos
Keyword(s):  
Fourier Transform ◽  
Room Temperature ◽  
Vibrational Mode ◽  
Clear Correlation ◽  
Interstitial Oxygen ◽  
Infrared Absorption Spectroscopy ◽  
Oxygen Defect ◽  
Absorption Bands ◽  
Local Vibrational Mode ◽  
Oxygen Complexes

Fourier transform infrared absorption spectroscopy was used to study the evolution of multivacancy-oxygen-related defects in the temperature range 200-300 °C in Czochralski-grown Si samples irradiated with MeV electrons or neutrons. A clear correlation between disappearance of the divacancy (V2) related absorption band at 2767 cm-1 and appearance of two absorption bands positioned at 833.4 and 842.4 cm-1 at 20 K (at 825.7 and 839.1 cm-1 at room temperature) has been found. Both these two emerging bands have previously been assigned to a divacancy-oxygen defect formed via interaction of mobile V2 with interstitial oxygen (Oi) atoms. The present study shows, however, that the two bands arise from different defects since the ratio of their intensities depends on the type of irradiation. The 842.4 cm-1 band is much more pronounced in neutron irradiated samples and we argue that it is related to a trivacancy-oxygen defect (V3O) formed via interaction of mobile V3 with Oi atoms or/and interaction of mobile V2 with VO defects.

Interaction of Atomic Hydrogen with Chalcogens in Gaas

1995 ◽  
Vol 378 ◽  
Author(s):  
J. Vetterhöffer ◽  
J. Weber
Keyword(s):  
Hydrogen Atom ◽  
Active Region ◽  
Atomic Hydrogen ◽  
Vibrational Mode ◽  
Depth Profiling ◽  
Infrared Absorption Spectroscopy ◽  
Local Vibrational Mode ◽  
Capacitance Voltage ◽  
Hydrogen Penetration ◽  
Secondary Ion

AbstractThe passivation by hydrogen of the shallow donors sulfur, selenium, and tellurium in GaAs was studied by infrared absorption spectroscopy (FTIR), capacitance-voltage (CV) depth profiling, and secondary ion mass spectroscopy (SIMS). Local vibrational mode (LVM) frequencies due to hydrogen-donor complexes agree with a microscopic model where the hydrogen atom is bound in the antibonding position to one of the donor’s neighboring gallium atoms. Our results suggest a hydrogen penetration depth much greater than the passivated region, however the infrared active region coincides with the passivated part of the material.

Trivacancy-oxygen complex in silicon: Local vibrational mode characterization

2009 ◽  
Vol 404 (23-24) ◽  
pp. 4568-4571
Author(s):  
L.I. Murin ◽  
B.G. Svensson ◽  
J.L. Lindström ◽  
V.P. Markevich ◽  
C.A. Londos
Keyword(s):  
Vibrational Mode ◽  
Local Vibrational Mode ◽  
Oxygen Complex

Quantitative assessment of Be acceptors in GaAs by local vibrational mode spectroscopy

1991 ◽  
Vol 69 (2) ◽  
pp. 971-974 ◽  
Author(s):  
J. Wagner ◽  
M. Maier ◽  
R. Murray ◽  
R. C. Newman ◽  
R. B. Beall ◽  
...  
Keyword(s):  
Quantitative Assessment ◽  
Vibrational Mode ◽  
Local Vibrational Mode ◽  
Mode Spectroscopy

Effects of Light on Schooling and Feeding of Jack Mackerel, Trachurus symmetricus

1968 ◽  
Vol 25 (2) ◽  
pp. 393-407 ◽  
Author(s):  
John R. Hunter
Keyword(s):  
Motion Picture ◽  
Nearest Neighbor ◽  
Motion Pictures ◽  
Separation Distance ◽  
The Other ◽  
Angular Deviation ◽  
Jack Mackerel ◽  
A Value

Schools of six jack mackerel each were photographed with infrared film at eight levels of luminance and also in darkness. Three indices were used to measure the behavior of the school from motion pictures. Two of the indices, mean distance to nearest neighbor and mean separation distance, were measures of the distances between individuals in a school; the other, mean angular deviation, was a measure of differences in orientation between individuals. A value for each index was calculated for each motion picture frame.From 12.1 to 6 × 10−6 ft-L no differences existed in the angular deviation of the school or in the distances between fish. At 6 × 10−7 ft-L the intervals between fish were much larger than at higher levels of brightness and groups showed little uniformity in their orientation. Below 6 × 10−7 ft-L (darkness) schools were dispersed and the distributions of values of angular deviation were random.The ability of jack mackerel to feed on live adult Artemia was also tested at eight levels of luminance and in darkness. The number of Artemia eaten at 6 × 10−5 ft-L was about half of that eaten at the normal daytime level of 12.1 ft-L. Few Artemia were eaten at 6 × 10−7 ft-L and none in darkness.Comparison of these data with measurements of light in the sea indicated that jack mackerel probably would be able to maintain schools near the surface on a moonless starlit night and that they probably could feed effectively near the surface on a full moonlight night.

ABSENCE OF PHASE TRANSITIONS ON TREE STRUCTURES

1993 ◽  
Vol 07 (29n30) ◽  
pp. 1947-1950 ◽  
Author(s):  
RAFFAELLA BURIONI ◽  
DAVIDE CASSI
Keyword(s):  
Long Range ◽  
Nearest Neighbor ◽  
Linear Chain ◽  
Mean Field ◽  
Range Order ◽  
The Other ◽  
Long Range Order ◽  
Field Phase ◽  
Tree Structures ◽  
Bethe Lattices

We rigorously prove that the correlation functions of any statistical model having a compact transitive symmetry group and nearest-neighbor interactions on any tree structure are equal to the corresponding ones on a linear chain. The exponential decay of the latter implies the absence of long-range order on any tree. On the other hand, for trees with exponential growth such as Bethe lattices, one can show the existence of a particular kind of mean field phase transition without long-range order.

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