Journal article

Publication year: 2016

Journal: Physical Review Letters

Volume number: 116

Issue number: 11

ISSN: 0031-9007

eISSN: 1079-7114

DOI Link: https://doi.org/10.1103/PhysRevLett.116.113002

Publisher: American Physical Society

Abstract: 
We have studied the photodissociation of CH+ in the Cryogenic Storage Ring at ambient temperatures below 10 K. Owing to the extremely high vacuum of the cryogenic environment, we were able to store CH+ beams with a kinetic energy of similar to 60 keV for several minutes. Using a pulsed laser, we observed Feshbach-type near-threshold photodissociation resonances for the rotational levels J = 0-2 of CH+, exclusively. In comparison to updated, state-of-the-art calculations, we find excellent agreement in the relative intensities of the resonances for a given J, and we can extract time-dependent level populations. Thus, we can monitor the spontaneous relaxation of CH+ to its lowest rotational states and demonstrate the preparation of an internally cold beam of molecular ions.

Harvard Citation style: O'Connor, A., Becker, A., Blaum, K., Breitenfeldt, C., George, S., Goeck, J., et al. (2016) Photodissociation of an Internally Cold Beam of CH⁺ Ions in a Cryogenic Storage Ring, Physical Review Letters, 116(11), Article 113002. https://doi.org/10.1103/PhysRevLett.116.113002

APA Citation style: O'Connor, A., Becker, A., Blaum, K., Breitenfeldt, C., George, S., Goeck, J., Grieser, M., Grussie, F., Guerin, E., von Hahn, R., Hechtfischer, U., Herwig, P., Karthein, J., Krantz, C., Kreckel, H., Lohmann, S., Meyer, C., Mishra, P., Novotny, O., ...Wolf, A. (2016). Photodissociation of an Internally Cold Beam of CH⁺ Ions in a Cryogenic Storage Ring. Physical Review Letters. 116(11), Article 113002. https://doi.org/10.1103/PhysRevLett.116.113002