Broadband laser excitation of van der Waals polymers in a cold atomic gas.

Donald Harris Levy

Jianing Han

In this article, we study the molecular states or polymer states excited from a broadband laser, in which case the dipole blockade will be suppressed. As expected, it is shown that more molecular states are observed through broadband laser excitations compared with narrow-band laser excitations. In addition, it is discovered that a larger energy difference, larger detuning, is required to form deeper potential wells.

Jenny Lam, Stephen Colby Rand, R. A. McFarlane

Christophe Michel Rene Jouvet, Claude Dedonder‐Lardeux, Séverine Martrenchard +1 more

Fluorescence excitation spectra of silver–argon van der Waals complexes are presented. An alternative experimental technique to laser evaporation has been used to produce the cold complexes. The van der Waals states observed correlate with the (4d10 5s1) 2S Ag ground state and (4d10 5p1)2P0 Ag first excited state. The excited state of the Ag–Ar complex is found to be 1235 cm−1 deep, which is unusually large for such metal–rare gas complexes. A perturbation due to a state correlating with the (4d9 5s2)2D metastable Ag state is also observed and analyzed.

戴长建, 陈子栋

N. Quirós, Naima Tariq, Timur V. Tscherbul +2 more

We have used laser ablation and helium buffer-gas cooling to produce titanium-helium van der Waals molecules at cryogenic temperatures. The molecules were detected through laser-induced fluorescence spectroscopy. Ground-state Ti(a^{3}F_{2})-He binding energies were determined for the ground and first rotationally excited states from studying equilibrium thermodynamic properties, and found to agree well with theoretical calculations based on newly calculated ab initio Ti-He interaction potentials, opening up novel possibilities for studying the formation, dynamics, and nonuniversal chemistry of van der Waals clusters at low temperatures.