Precision Spectroscopy of Atomic Hydrogen

Precision measurements with atomic hydrogen masers

Laser sources for precision spectroscopy on atomic strontium.

We present a new laser setup designed for high-precision spectroscopy on laser cooled atomic strontium. The system, which is entirely based on semiconductor laser sources, delivers 200 mW at 461 nm for cooling and trapping atomic strontium from a thermal source, 4 mW at 497 nm for optical pumping from the metastable P23 state, 12 mW at 689 nm on linewidth less than 1 kHz for second-stage coolin...

Spectroscopy of atomic hydrogen How is the Rydberg constant determined ?

This article presents a review of the most recent theoretical and experimental results in hydrogen. We particularly emphasize the methods used to deduce the Rydberg constant R∞ and we consider the prospects for future improvements in the precision of R∞.

Indirect Determination of Ascorbic Acid by Atomic Absorption Spectroscopy

A new and simple method followed by atomic absorption spectrometry has been developedfor indirect determination of ascorbic acid (AA). The proposed method was based on the oxidationof AA to dehydroascorbic acid with Cu2+cation(200mgL-1)in an ammonium thiocyanatesolution atpH2.4. AA reduces Cu2+to Cu+followed by the precipitation of Cu+ with SCN-. Then, the excess ofCu2+in the solution was measu...

Cryopumping of atomic hydrogen

A high-density ultracold spin polarized atomic hydrogen jet’ will be used as an internal target for the experiments NEPTUN and NEPTUN-A,2 which will study spin effects in proton-proton scattering at energies of 400 GeV and 3 TeV at the UNK accelerator being built at Protvino, USSR. The ultimate intensity goaI of this jet is a polarized beam of 10” atoms/s. In order to keep the vacuum pressure i...