J. M. Gagné

Production de vapeur d’uranium par pulvérisation cathodique dans une cathode creuse: efficacités relatives des gaz Ne, Ar, Kr et concentration à l’état 5 L60

We have investigated the production of uranium vapors in the (5)L(0)(6) ground state using a sputtering technique. We have also compared the performance of the Ne, Ar, Kr gases as carrier agents. We have found that the krypton gas gives a maximum yield with minimum energy. Finally the density of U vapors has been found to be of the order of 10(12) atoms cm(-3.).

Etude par absorption d’un faisceau laser d’une vapeur d’U238(L560) obtenue à l’aide d’une lampe à cathode creuse

The density of U atoms in the (5)L(0)(6) ground state present in a vapor of this element from a hollow cathode lamp has been measured using laser absorption spectroscopy. The influence of the carrier gases (Ar, Kr, Xe) on the density, the absorption coefficient profiles, and on the ratio of U atoms to the dissipated electrical power has been investigated. It has been found that, in our range of operating conditions, the xenon gas is the most efficient. With xenon, a density of 2.2 x 10(12) cm(-3) ground-state U atoms is obtained when the lamp dissipates 40 W of electrical power.

Odd-even staggering of 235U from the 5027 Å line in U I

Abstract We present a new value of the experimental odd-even staggering coefficient for the isotope 235 of U deduced from the 5027 A line of U I. This result is compared with the value obtained from measured shifts of the 4244 A line in U II.

Isotope shift of 234 U, 236 U, 238 U in Ui

New and very accurate data of isotope shifts and relative isotope shifts in 234U, 236U, 238U are presented. The invariance of the relative isotope shift, for the transitions we have investigated, supports the hypothesis that the so-called specific mass effect is negligible in uranium.

Compact continuous HF microwave-discharge mixing laser

The performance of a continuous chemical laser is discussed. Fluorine atoms are produced in a SF6 + He mixture by means of a microwave-discharge apparatus that operates in a continuous mode. A maximum output power of 4 W is obtained for a 5 cm length of amplifying medium; this power output is primarily due to P transitions from the 1-0 and 2-1 bands. Weak transitions in the 3-2 band are also observed. The maximum value of measured gain is 0.11 cm−1; good agreement is obtained between theoretical and experimental values of gain.

Isotope shift 238U-233U from some lines in the UI spectrum

Abstract New values for the isotope shift 233 U- 238 U are presented from some transitions of the type f 3 ds 2 − f 3 dsp and f 3 d 2 s − f 3 dsp in the visible spectrum of UI.

Transverse-Flow Quasi-cw HF Chemical Laser: Design and Preliminary Performance

A small transverse-flow HF chemical laser has been constructed using a large volume microwave plasma generator for the production of F atoms. The F atoms react with hydrogen to form the lasing HF molecules. The active medium is about 5 cm long, and the maximum average laser power was found to be 560mW for all lines. Three laser lines with wavelengths 2.61 microm, 2.64 microm, and 2.73 microm were observed. The time-varying laser transition profile closely resembles the density profile of the excited fluorine atoms in the plasma. Both profiles are greatly affected by changes in flow conditions.