Effects of Atomic Hydrogen in Molecular Beam Epitaxy.

Effects of hydrogen during molecular beam epitaxy of GaN

Effects of shutter transients in molecular beam epitaxy

: We have studied the effects of shutter transients (STs) in molecular beam epitaxy (MBE). Two series of samples were grown by MBE and evaluated by X-ray diffraction (XRD) and X-ray reflectivity (XRR) measurements. The effects of STs were evaluated by growth rate (GR) analysis using a combination of growth time (GT) and thickness evaluated by XRD and XRR measurements. We revealed two opposite e...

Atomic and molecular hydrogen elimination in the crossed beam

The chemical reaction dynamics to form d1-diacetylene, DCCCCH (X S), and the d1-butadiynyl radical, DCCCC, via the reaction of d1-ethinyl, C2D (X S), with acetylene, C2H2 (X Sg ), are explored in a crossed molecular beam experiment at an average collision energy of 26.1 kJ mol . The experiments show that the reaction follows indirect scattering dynamics via a C4H2D intermediate. The calculation...

Ultra-cold atomic hydrogen beam

We investigated two methods of producing a continuous free beam of electron-spin polarized atomic hydrogen, using a 7.5 T solenoid magnetic field and a helium film-coated cell . The first method involves accumulating H 1 at high field in a 300 mK storage cell and flipping the electron spin by using microwaves to drive a hyperfine transition . The resulting HT atoms are accelerated and focused b...

Basics of Molecular Beam Epitaxy (MBE)

A brief introduction to the MBE technique is presented with main attention to the elemental source MBE. A discussion on the effusion cell as beam source is shortly given starting from ideal cases to real cells homogeneity problems. A short review regarding the thermodynamic approach to the MBE is pointed out. Focusing on the possibility that, despite the fact that MBE processes occur under stro...