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.


May 15, 2019
Chinh, Santino, and Thien were science fair judges at the 25th Annual New Haven Science Fair and saw some wonderful projects! There were a myriad of posters exploring...
April 19, 2019
The Johnson Lab had a great time at the Gaseous Ions GRS and GRC in February at Ventura, CA. Nan gave talks at both the GRS and GRC (hot topic) with the title “Spying on the...
April 19, 2019
Mark was pleased to give the Introductory Lecture at the Faraday Discussion in York, England on “Advances in Ion Spectroscopy: From Astrophysics to Biology,” which featured a...

Selected Publications:

Deconstructing Water’s Diffuse OH Stretching Vibrational Spectrum with Cold Clusters

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