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- Argon (1)
- Atomic force microscopy (1)
- Crystalline structure (1)
- Diatomic molecules (1)
- Diffusion coefficients (1)
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- Electronic mechanisms (1)
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- Ion signal (1)
- Laser cooling (1)
- Laser excitation (1)
- Leroy-Bernstein analysis (1)
- Magneto-optical effects (1)
- Metastable states (1)
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- Photoassociative spectroscopy (1)
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- Photoexcitation (1)
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- Surface diffusion (1)
- Trapped ions (1)
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Articles 1 - 2 of 2
Full-Text Articles in Physical Sciences and Mathematics
Photoassociative Spectroscopy Of Ultracold Metastable Argon, M. K. Shaffer, G. Ranjit, C. I. Sukenik, M. Walhout
Photoassociative Spectroscopy Of Ultracold Metastable Argon, M. K. Shaffer, G. Ranjit, C. I. Sukenik, M. Walhout
Physics Faculty Publications
We present results of photoassociative spectroscopy performed on ultracold metastable argonatoms in a magneto-optical trap. Ion spectra are obtained with laser detuning up to a few gigahertz below the 4s[3/2]2 → 4p[5/2]3 trapping transition at 811 nm and with intensities in a range of ~(102-105)ISat. We also compute dipole-dipole potentials for both singly and doubly excited diatomic molecules and use a Leroy-Bernstein analysis to determine the approximate vibrational spacings in the (s+p) and (p+p) manifolds. Based on this theoretical framework, we explain a broad background feature in our data and suggest that …
Electronically Enhanced Surface Diffusion During Ge Growth On Si(100), Ali Orguz Er, Hani E. Elsayed-Ali
Electronically Enhanced Surface Diffusion During Ge Growth On Si(100), Ali Orguz Er, Hani E. Elsayed-Ali
Physics Faculty Publications
The effect of nanosecond pulsed laser excitation on surface diffusion during the growth of Ge on Si(100) at 250 °C was studied. In situ reflection high-energy electron diffraction was used to measure the surface diffusion coefficient while ex situ atomic force microscopy was used to probe the structure and morphology of the grown quantum dots. The results show that laser excitation of the substrate increases the surface diffusion during the growth of Ge on Si(100), changes the growth morphology, improves the crystalline structure of the grown quantum dots, and decreases their size distribution. A purely electronic mechanism of enhanced surface …