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Real-time x-ray studies of gallium adsorption and desorption
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View: Figures


Image of FIG. 1.
FIG. 1.

The scattering geometry of the GISAXS. The linear detector is placed parallel to the sample surface to measure the scattering as a function of .

Image of FIG. 2.
FIG. 2.

The real-time GISAXS evolution of the sapphire surface during Ga adsorption and desorption at . The scan was taken at .

Image of FIG. 3.
FIG. 3.

Selected GISAXS scans during desorption after Ga exposure.

Image of FIG. 4.
FIG. 4.

Selected slices from the real-time GISAXS scans at , which shows the evolution of the surface morphology during desorption.

Image of FIG. 5.
FIG. 5.

The Guinier plot obtained from the GISAXS measurement taken after the Ga deposition has terminated. The solid line indicates the linear fit to the data.

Image of FIG. 6.
FIG. 6.

Fourier transform of the measured GISAXS at , which gives approximately the real-space electron density correlation. The peak at indicates the average spacing between droplets and the intensity decay at smaller values corresponds to the electron density distribution of individual droplets.

Image of FIG. 7.
FIG. 7.

The AFM analysis of the Ga nanodots on sapphire, showing a AFM topograph.

Image of FIG. 8.
FIG. 8.

The intensity evolution of the (a) near-specular and (b) diffuse parts of the GISAXS profiles in the predroplet regime as a function of Ga exposure time. The sapphire substrate temperature was .

Image of FIG. 9.
FIG. 9.

The intensity evolution of the near-specular part of the GISAXS profile during Ga adsorption∕desorption on GaN at .

Image of FIG. 10.
FIG. 10.

Illustrations of possible Ga desorption models: (a) coalescence and (b) inhomogeneous desorption.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Real-time x-ray studies of gallium adsorption and desorption