The line shape of laser-induced ionizing collisions of ultracold Kr gas is investigated near the and transition. The rate increases several times when the laser is red tuned by a few times of the natural width, while it sharply decreases for a slight blue detuning. This frequency dependence of the collision rate is due to the collision dynamics characteristic of ultracold atoms in a near-resonant light. Our experimental results on metastable Kr atoms show a good qualitative agreement with semiclassical Monte Carlo simulation of the cold collision dynamics.
- Received 8 April 1994
- Published in the issue dated 7 November 1994
© 1994 The American Physical Society