Physics – Chemical Physics
Scientific paper
2012-04-04
Physics
Chemical Physics
26 pages, 10 figures
Scientific paper
We describe a pulsed rotating supersonic beam source, evolved from an ancestral device [M. Gupta and D. Herschbach, J. Phys. Chem. A 105, 1626 (2001)]. The beam emerges from a nozzle near the tip of a hollow rotor which can be spun at high-speed to shift the molecular velocity distribution downward or upward over a wide range. Here we consider mostly the slowing mode. Introducing a pulsed gas inlet system, cryocooling, and a shutter gate eliminated the main handicap of the original device, in which continuous gas flow imposed high background pressure. The new version provides intense pulses, of duration 0.1-0.6 ms (depending on rotor speed) and containing ~10^12 molecules at lab speeds as low as 35 m/s and ~ 10^15 molecules at 400 m/s. Beams of any molecule available as a gas can be slowed (or speeded); e.g., we have produced slow and fast beams of rare gases, O2, Cl2, NO2, NH3, and SF6. For collision experiments, the ability to scan the beam speed by merely adjusting the rotor is especially advantageous when using two merged beams. By closely matching the beam speeds, very low relative collision energies can be attained without making either beam very slow.
Herschbach Dudley R.
Hickey Michael
Krasovitskiy V.
Lyuksyutov Igor F.
Rathnayaka K. D. D.
No associations
LandOfFree
Pulsed rotating supersonic source used with merged molecular beams does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Pulsed rotating supersonic source used with merged molecular beams, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pulsed rotating supersonic source used with merged molecular beams will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-32851