Sample Preparation

Preparation of high quality, pure samples is very important if you are going to study very weakly bound complexes. We have a custom built high vacuum line (built by Roy Wentz, glassblower at the University of Michigan) that allows transfer of high purity gas phase samples to a glass sample bulb. The components of interest are condensed into the sample bulb from a lecture bottle or other source in concentrations that will lead to a 1-3% mixture when diluted to a few atm. total pressure with a rare gas such as argon or a helium/neon mixture.

A 2 liter glass sample bulb is shown attached to one of the outlets on the vacuum manifold. The high vacuum is made possible by a diffusion pump that operates on the same principles as the (much larger scale) pumps on the vacuum chamber. The glass diffusion pump in this case is at the right of the vacuum line and is shown below. Unlike the water cooled diffusion pumps that are a part of the vacuum chamber, this one is air cooled although uses the same pump oil as the larger pumps. The orange rubber tubing goes from the outlet of the diffusion pump to a roughing pump which lives in the cupboard under the hood.