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Related Experiment Video

Updated: May 8, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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A new approach toward transition state spectroscopy.

Kirill Prozument¹, Rachel Glyn Shaver, Monika A Ciuba

¹MIT, Department of Chemistry, Cambridge, MA 02139, USA. kuyanov@mit.edu

Faraday Discussions

|September 12, 2013

Summary

Chirped-Pulse millimetre-Wave spectroscopy reveals species populations after photolysis. This study discusses the non-observation of vinylidene, a potential co-product, in vinyl cyanide photolysis.

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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Area of Science:

Chemical Physics
Molecular Spectroscopy
Photochemistry

Background:

Chirped-Pulse millimetre-Wave (CPmmW) rotational spectroscopy offers novel insights into photolysis transition states.
Rotational spectra intensities can determine species, isomer, and vibrational populations if rotational populations are thermalized.

Purpose of the Study:

To investigate the formation and detection of S(0) vinylidene during vinyl cyanide photolysis.
To analyze species and vibrational populations under varying initial rotational excitation conditions.

Main Methods:

Utilized CPmmW rotational spectroscopy to study the 193 nm photolysis of vinyl cyanide (acrylonitrile).
Analyzed J = 0-1 transitions in the resulting spectra to identify molecular species and their vibrational states.

Main Results:

Observed over 20 vibrational levels of HCN and HNC, indicating their formation as photolysis products.
Did not detect transitions corresponding to vinylidene or highly excited acetylene vibrational levels.

Conclusions:

The non-observation of vinylidene suggests specific reaction dynamics or detection limitations under the experimental conditions.
CPmmW spectroscopy is effective for characterizing photolysis products like HCN and HNC, but challenges remain in detecting transient species like vinylidene.