Journal
PHYSICAL REVIEW LETTERS
Volume 116, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.113002
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Funding
- European Research Council [StG 307163]
- Weizmann Institute through the Joseph Meyerhoff program
- Deutsche Forschungsgemeinschaft (DFG) within the DFG Priority Program Physics of the Interstellar Medium [1573]
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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.
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