Photodissociation of an Internally Cold Beam of CH^{+} Ions in a Cryogenic Storage Ring. uri icon

abstract

  • We have studied the photodissociation of CH^{+} in the Cryogenic Storage Ring at ambient temperatures below 10K. Owing to the extremely high vacuum of the cryogenic environment, we were able to store CH^{+} beams with a kinetic energy of 60keV 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.

published proceedings

  • Phys Rev Lett

author list (cited authors)

  • O'Connor, A. P., Becker, A., Blaum, K., Breitenfeldt, C., George, S., Gck, J., ... Wolf, A.

complete list of authors

  • O'Connor, AP||Becker, A||Blaum, K||Breitenfeldt, C||George, S||Göck, J||Grieser, M||Grussie, F||Guerin, EA||von Hahn, R||Hechtfischer, U||Herwig, P||Karthein, J||Krantz, C||Kreckel, H||Lohmann, S||Meyer, C||Mishra, PM||Novotný, O||Repnow, R||Saurabh, S||Schwalm, D||Spruck, K||Sunil Kumar, S||Vogel, S||Wolf, A

publication date

  • March 2016