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.


January 2, 2018
A recent JLab communication, "Spectroscopic characterization of a strongly interacting C(2)H group on the EMIM+ cation in the (EMIM+)2X-, (X=BF4, Cl, Br, and I) ternary...
November 28, 2017
Mark was pleased to give three “Frontiers in Chemical Research” lectures at Texas A&M this month. Special thanks to Simon North and David Russell for their excellent...
October 31, 2017
Happy Halloween from the Johnson Lab!

Selected Publications:

Spectroscopic Snapshots of the Proton-transfer Mechanism in Water

Capture of CO2 by a Cationic NiI Complex in the Gas Phase and Characterization of the Bound Activated CO2 Molecule through Cryogenic Ion Vibrational Predissociation Spectroscopy

Modes of Activation of Organometallic Iridium Complexes for Catalytic Water and C-H Oxidation

Vibrational spectral signature of the proton defect in the three-dimensional H+(H2O)21 cluster