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Circular dichroism in photoelectron images from aligned nitric oxide molecules

Sen, Ananya; Pratt, S.T.; Reid, Katharine L.

Circular dichroism in photoelectron images from aligned nitric oxide molecules Thumbnail


Ananya Sen

S.T. Pratt

Katharine L. Reid


We have used velocity map photoelectron imaging to study circular dichroism of the photoelectron angular distributions (PADs) of nitric oxide following two-color resonance-enhanced two-photon ionization via selected rotational levels of the A ²∑⁺ , v' = 0 state. By using a circularly polarized pump beam and a counter-propagating, circularly polarized probe beam, cylindrical symmetry is preserved in the ionization process, and the images can be reconstructed using standard algorithms. The VMI set up enables individual ion rotational states to be resolved with excellent collection efficiency, rendering the measurements considerably simpler to perform than previous measurements conducted with a conventional photoelectron spectrometer. The results demonstrate that circular dichroism is observed even when cylindrical symmetry is maintained, and serve as a reminder that dichroism is a general feature of the multiphoton ionization of atoms and molecules. The observed PADs are in good agreement with calculations based on parameters extracted from previous experimental results obtained by using a time-of-flight electron spectrometer.

Journal Article Type Article
Acceptance Date Apr 13, 2017
Publication Date May 3, 2017
Deposit Date May 9, 2017
Publicly Available Date May 9, 2017
Journal Journal of Chemical Physics
Print ISSN 0021-9606
Electronic ISSN 1089-7690
Publisher American Institute of Physics
Peer Reviewed Peer Reviewed
Volume 147
Issue 1
Article Number 013927
Public URL
Publisher URL
Additional Information This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in The Journal of Chemical Physics 147, 013927 (2017); doi: 10.1063/1.4982218and may be found at


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