Far-infrared laser-emission spectroscopy on ammonia isotopomers

The quest for crystalline ion beams

“…The gap between large-scale storage rings and rf quadrupole ion traps has recently been bridged by the table-top storage ring PALLAS [37][38][39]. The idea to close a quadrupole ion guide to a ring goes back to Paul and others [40,13].…”

“…The 24 Mg + ions are simultaneously laser cooled (see figure 2) to zero centre-of-mass velocity. This cold stationary ion ensemble is then accelerated [39] by the light pressure of the continuously tuned co-propagating laser beam, as sketched in the insert of figure 4(a). The ion beam velocity of v = 2800 m s −1 (beam energy 1 eV) is determined by the decelerating force of the counter-propagating laser beam, which is kept at fixed frequency.…”

Thev1andv3bands of ND3

“…Farinfrared laser emissions have been observed by optically pumping ND 3 samples with a tunable 20 atm CO 2 laser [19]. On the other hand, the v 1ˆ1 (A 0 1 and A 00 2 symmetry) and v 3ˆ1 (E 0 and E 00 symmetry) stretching states are poorly known ; in fact, the¸1 and¸3 fundamentals were analysed only at modest resolution more than 40 years ago [20].…”

A theoretical room-temperature line list for 15NH3

“…Experimentally the ro-vibrational spectra of 15 NH 3 have been studied in a large number of works, including rotation-inversion spectrum [12][13][14][15][16][17], fundamental bands [18][19][20][21][22][23][24][25][26][27], overtone bands [28][29][30][31][32][33], hot bands [34][35][36][37], and intensity measurements [38][39][40][41]. Some of these data are now collected in the HITRAN database [42].…”