We have developed a nozzle source that delivers a continuous beam of atomic helium or molecular hydrogen having a high degree of transverse coherence and with adequate optical brightness to enable new kinds of experiments. Using this source we have measured single slit diffraction patterns and the first ever speckle-diffraction patterns using atomic and molecular de Broglie waves. Our results s...

The Doppler-free spectroscopy of atomic thallium (Tl and Tl) 6P1/2 → 7S1/2 transitions have been observed using two counter-propagating laser beams perpendicular to the atomic beam, and the absolute frequencies of these transitions have been measured to an accuracy of <1 MHz (1 ppb) using optical frequency comb. Our results improved the hyperfine splittings by a factor of 7∼8. The isotope shift...

A procedure is described for the simultaneous, automatic determination of serum calcium and magnesium with the AutoAnalyzer, and a dualchannel, double-beam atomic absorption spectrophotometer, the IL Model 153. Advantages over existing procedures include a high rate of analysis (90 samples or 180tests per hour) and low sample consumption (a total of 30 l for both determinations). We have compar...

Using continuous radio-frequency waves a coherent beam of atoms can be extracted from a magnetically trapped gaseous Bose-Einstein condensate. These novel atomic beams have matter-wave properties that are very similar to those of laser light in classical optics and are therefore called atom lasers. Furthermore, coupling out atoms from a Bose gas allows one to probe the dramatic changes in the p...

This review describes the production of atomic strontium samples at ultra-low temperature and at high phase-space density, and their possible use for physical studies and applications. We describe the process of loading a magneto-optical trap from an atomic beam and preparing the sample for high precision measurements. Particular emphasis is given to the applications of ultracold Sr samples, sp...

The Doppler-free spectroscopy of atomic thallium (Tl and Tl) 6P1/2 → 7S1/2 transitions have been observed using two counter-propagating laser beams perpendicular to the atomic beam, and the absolute frequencies of these transitions have been measured to an accuracy of <1 MHz (1 ppb) using optical frequency comb. The hyperfine splittings derived from our results were improved by a factor of 7∼8....

A high-intensity, low-emittance atomic muonium (M =\mu^+ + e^- =μ++e− ) beam is being developed, which would enable improving the precision of M sp...

We have studied laser collimation of a chromium atomic beam using a transverse polarization gradient cooling scheme. We present detailed measurements of the angular distribution of atoms on the beam axis, over a broad range of laser intensities and detunings including those which produce significant excitation, and observe collimation angles as small as 0.16 ± 0.01 mrad (50% quantile). We compa...

Examining individual molecules at the atomic scale is one of the most challenging problems of modern science. When crystallization of a molecule is difficult or impossible, an X-ray, electron, or positron micro-beam can act as a probe that enables the scientist to determine the structure of a single molecule. However, the beam itself can damage the molecule, in which case the molecule becomes f...

introduction: globally, the need for radiotherapy as a part of cancer management increases every year. thus, the shielding for megavoltage radiotherapy rooms is of great importance. materials and methods: in the present study, 14 types of developed high-density concrete with densities ranging from 2.45 to 5.11 were simulated by using monte carlo method. the linear attenuation coefficient and th...