PHOTOPUMPING RESONANCE FOR MODIFYING THE KINETICS OF A NEON-LIKE LA47+ LASER

High-precision measurements are presented of an excellent resonance be tween the 3s(1/2) --> 2p(3/2) (J = 1) transition in neonlike La47+ and the 1s(21)S(0)-1s2p(1)P(1) line in heliumlike Ti20+. The measurements were carried out with a high-resolution crystal spectrometer on the P LT tokamak. Neonlike La47+ and heliumlike Ti20+ were produced and show n to coexist under the same plasma conditions. The difference between the two transitions was found to be 96 +/- 38 ppm. This value is sever al times less than the width of each transition expected from thermal broadening. The resonance can be used for selective modification of th e kinetics of a proposed 57 Angstrom laser based on neonlike La47+.