Electronic and vibrational radiative cooling of the small carbon clusters ${{\mathrm{C}}_{4}}^{\ensuremath{-}}$ and ${{\mathrm{C}}_{6}}^{\ensuremath{-}}$

Electronic and vibrational radiative cooling of the small carbon clusters ${C_{4}}^{-}$ and ${C_{6}}^{-}$

N. Kono, R. Suzuki, T. Furukawa, J. Matsumoto, H. Tanuma, H. Shiromaru, T. Azuma, and K. Hansen

Phys. Rev. A 98, 063434 – Published 28 December 2018

Abstract

Delayed electron detachment yields of ${C_{4}}^{-}$ and ${C_{6}}^{-}$ induced by photoexcitation in an electrostatic ion storage ring were measured as functions of excitation energies and laser firing times, allowing for a mapping of their radiative cooling in a wide energy range. The energy window concept and discrimination of one- and two-photon absorption are critical in understanding the obtained results. The experimentally obtained electronic and vibrational cooling rates were consistent with a simulation based on detailed-balance theory. The even-odd alternation of vibrational cooling rates, predicted from IR intensities, was also examined. We found that the larger anion cools faster, with no indication of an even-odd alternation.

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Received 4 October 2018

DOI:https://doi.org/10.1103/PhysRevA.98.063434

Physics Subject Headings (PhySH)

Electronic excitation & ionization

Atomic, Molecular & Optical

Authors & Affiliations

N. Kono^*, R. Suzuki, T. Furukawa^†, J. Matsumoto, H. Tanuma, and H. Shiromaru

Faculty of Science, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan

T. Azuma

Atomic, Molecular and Optical Physics Laboratory, RIKEN, Wako, Saitama, 351-0198, Japan

K. Hansen

Joint Center of Quantum Studies and Department of Physics, Tianjin University, Tianjin 300072, China and Department of Physics, Gothenburg University, 41296 Gothenburg, Sweden

^*Corresponding author: kouno-naoko@ed.tmu.ac.jp
^†Present Address: Department of Physics, Toho University; takeshi.furukawa@sci.toho-u.ac.jp

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Vol. 98, Iss. 6 — December 2018

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Physical Review A

covering atomic, molecular, and optical physics and quantum information

Electronic and vibrational radiative cooling of the small carbon clusters ${C_{4}}^{-}$ and ${C_{6}}^{-}$

N. Kono, R. Suzuki, T. Furukawa, J. Matsumoto, H. Tanuma, H. Shiromaru, T. Azuma, and K. Hansen

Phys. Rev. A 98, 063434 – Published 28 December 2018

Abstract

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Physical Review A

covering atomic, molecular, and optical physics and quantum information

Electronic and vibrational radiative cooling of the small carbon clusters C4− and C6−

N. Kono, R. Suzuki, T. Furukawa, J. Matsumoto, H. Tanuma, H. Shiromaru, T. Azuma, and K. Hansen

Phys. Rev. A 98, 063434 – Published 28 December 2018

Abstract

Physics Subject Headings (PhySH)

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Electronic and vibrational radiative cooling of the small carbon clusters ${C_{4}}^{-}$ and ${C_{6}}^{-}$