Desorption Kinetics of Indium at the InAs/GaAs(001) Heterointerface

1992 ◽  
Vol 280 ◽  
Author(s):  
Ron Kaspi ◽  
Keith R. Evans
Keyword(s):  
Mass Spectrometry ◽  
Phase Transition ◽  
Flux Ratio ◽  
Desorption Kinetics ◽  
Surface Phase ◽  
Desorption Mass Spectrometry ◽  
First Order ◽  
Desorption Activation Energy ◽  
Kinetics Of ◽  
Temperature Surface

ABSTRACTDesorption Mass Spectrometry (DMS) is used to monitor In desorption kinetics at the InAs/GaAs (001) heterointerface. In incorporation is determined to be significantly affected by temperature, surface reconstruction, and the V/III flux ratio. It is shown that the onset of the As-stabilized (2×4)-to-In-stabilized (4×2) surface phase transition is surface stoichiometry dependent, and that both the As-stabilized and the In-stabilized surface exhibit first order desorption behavior. Desorption activation energy of In from the (2×4) and the (4×2) surface is measured. In addition to an In-stabilized regime, an In-accumulated regime is identified by its deviation from first order desorption behavior.

Comparison of H2 Desorption Kinetics from Si(111)7×7 and Si(100)2×l

1990 ◽  
Vol 204 ◽  
Author(s):  
M. L. Wise ◽  
B. G. Koehler ◽  
P. Gupta ◽  
P. A. Coon ◽  
S. M. George
Keyword(s):  
Activation Energy ◽  
Preexponential Factor ◽  
Desorption Kinetics ◽  
Bond Energies ◽  
First Order ◽  
First Order Kinetics ◽  
Upper Limits ◽  
Desorption Activation Energy ◽  
Temperature Programmed ◽  
Kinetics Of

ABSTRACTThe desorption kinetics of hydrogen from the β1 H2 -TPD state on Si(111)7×7 and Si(100)2×l were studied using laser-induced thermal desorption (LITD) and temperature programmed desorption (TPD) techniques. Isothermal LITD studies of H2 desorption from Si(111)7×7 revealed second-order kinetics with a desorption activation energy of Ed = 62 ±4 kcal/mol and a preexponential factor of Vd = 92 ±10 cm2 /s. In contrast, H2 desorption from Si(100)2×l revealed first-order kinetics with an activation energy of Ed = 58 ±2 kcal/mol and a preexponential factor of Vd = 5.5 ±0.5 × 1015 s−1. The desorption kinetics yield similar upper limits for the Si-H bond energies but different desorption mechanisms on Si(lll)7×7 and Si(100)2×l.

Photoelectron diffraction and photoelectron holography study of a Ge(111) high-temperature surface phase transition

1993 ◽  
Vol 281 (3) ◽  
pp. 178-179
Author(s):  
T.T. Tran ◽  
S. Thevuthasan ◽  
Y.J. Kim ◽  
D.J. Friedman ◽  
A.P. Kaduwela ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Surface Phase ◽  
Surface Phase Transition ◽  
Photoelectron Diffraction ◽  
Temperature Surface

Photoelectron diffraction and photoelectron holography study of a Ge(111) high-temperature surface phase transition

1993 ◽  
Vol 281 (3) ◽  
pp. 270-284 ◽  
Author(s):  
T.T. Tran ◽  
S. Thevuthasan ◽  
Y.J. Kim ◽  
D.J. Friedman ◽  
A.P. Kaduwela ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Surface Phase ◽  
Surface Phase Transition ◽  
Photoelectron Diffraction ◽  
Temperature Surface

SURFACE PHASE TRANSITION AND KINETICS OF Cu3Au (111)

1989 ◽  
Vol 50 (C7) ◽  
pp. C7-283-C7-287 ◽  
Author(s):  
X-M. ZHU ◽  
I. K. ROBINSON ◽  
E. VLIEG ◽  
H. ZABEL ◽  
J. A. DURA ◽  
...  
Keyword(s):  
Phase Transition ◽  
Surface Phase ◽  
Surface Phase Transition ◽  
Kinetics Of

Fragmentation of the α-Amino Acid Methionine in Field Desorption Mass Spectrometry

1978 ◽  
Vol 33 (7) ◽  
pp. 770-781 ◽  
Author(s):  
J. van der Greef ◽  
N. M. M. Nibbering ◽  
H.-R. Schulten ◽  
W. D. Lehmann
Keyword(s):  
Mass Spectrometry ◽  
Amino Acid ◽  
Desorption Kinetics ◽  
Fragmentation Pattern ◽  
Field Desorption ◽  
Stable Isotope Labelling ◽  
Desorption Mass Spectrometry ◽  
Combined Use ◽  
Field Desorption Mass Spectrometry ◽  
Amino Acid Methionine

AbstractField Desorption Mass Spectrometry, a-Amino Acid Methionine The fragmentation of methionine in field desorption mass spectrometry has been studied. Decomposition mechanisms are described which are based on stable isotope labelling, low and high resolution field desorption, and the application of field desorption kinetics. The combined use of these techniques for the study of some fundamental fragmentations in field desorption is demonstrated successfully. Further, a comparison with the fragmentation pattern of methionine under electron impact, chemical ionization and Curie point pyrolysis is given.

On the Wettability, Encapsulation and Surface Phase Transition in Monotectic Liquid Metallic Systems

2007 ◽  
Vol 537-538 ◽  
pp. 527-532 ◽  
Author(s):  
György Kaptay
Keyword(s):  
Phase Transition ◽  
Surface Tension ◽  
Liquid Metal ◽  
Lower Surface ◽  
Surface Phase ◽  
Surface Phase Transition ◽  
First Order ◽  
Interfacial Energies ◽  
Order Surface ◽  
Metallic Systems

In the present paper the wettability of a liquid metal by another liquid metal is studied theoretically, based on a recent model on interfacial energies in metallic systems. It appears that in all practical cases the liquid metal with a lower surface tension will perfectly wet (with a zero contact angle) the liquid metal with a higher surface tension practically at any temperature, and therefore will encapsulate it. As a result, the first order surface phase transition will start in monotectic metallic systems at 0 K. The phenomenon of the surface phase transition is considered in some details, based on a recent paper.

Study of the Kinetics of the Phase Transition of the First Order in Tetracosane C24H50 by Fourier-Transform IR Spectroscopy

2019 ◽  
Vol 61 (10) ◽  
pp. 1785-1789 ◽  
Author(s):  
V. A. Marikhin ◽  
S. A. Gur’eva ◽  
L. P. Myasnikova ◽  
B. Z. Volchek ◽  
D. A. Medvedeva
Keyword(s):  
Phase Transition ◽  
Fourier Transform ◽  
Ir Spectroscopy ◽  
Fourier Transform Ir Spectroscopy ◽  
First Order ◽  
Fourier Transform Ir ◽  
Kinetics Of
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