Welcome

 

About Our Group:

We design, build and exploit new types of instruments that provide qualitatively new pictures of how chemical reactions occur. By coupling mass-selective vibrational spectroscopy with cryogenic ion processing, we are able to study a wide variety of chemical phenomena, including small molecule activation, gas-liquid interfacial chemistry, and intracluster hydrogen bonding.

News

May 4, 2026
It was a week with weather to complement great chemistry! Erica was co-chair of the accompanying GRS where Madeeha gave an invited talk. Both presented well-attended posters...
April 10, 2026
This is a much-needed how-to reference for all who want Python to enhance our work without investing weeks lost in code-land. Thanks Chris!!

Selected Publications:

Autobiography of Mark A. Johnson


Microcanonical Kinetics of Water-Mediated Proton Transfer in 4ABAH+‧(H2O)n=4-6 Clusters (ABA = Aminobenzoic Acid): A Model System for Size-Dependent Relaxation to Ergodic Behavior


Microcanonical Kinetics of Water-Mediated, Long Range Proton Transfer in Microhydrated 4-Aminobenzoic Acid