Erlangen 2022 – scientific programme
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SYLA: Symposium Laboratory Astrophysics
SYLA 2: Laboratory Astrophysics
SYLA 2.3: Talk
Monday, March 14, 2022, 17:15–17:30, Audimax
The Optical Spectrum and Astrochemical Relevance of 1-Cyanoadamantane+ — •Parker Crandall, Robert Radloff, Marko Förstel, and Otto Dopfer — Technische Universität Berlin, Berlin, Germany
Astrochemical measurements have demonstrated similarities between the IR spectra of diamondoids and unidentified infrared emission (UIR) bands seen in the spectra of young stars with circumstellar disks.[1,2] Due to their low ionization energy and open-shell character, it is also suggested that the radical cations of these molecules might be responsible for features in the well-known diffuse interstellar bands (DIBs).[3] However, the optical spectra of these cations have not been measured experimentally until recently. Here, we present the first optical spectrum of the 1-cyanoadamantane cation (C11H15N+) and compare it to the recently reported spectrum of the adamantane radical cation.[4] These spectra were recorded in the gas phase at 5 K using a cryogenic 22-pole ion trap. The experimental results are compared to time-dependent DFT calculations for interpretation. Geometric changes due to Jahn-Teller distortion and the astrophysical implications of these ions will also be discussed.
[1] O. Guillois, et al., Astrophys. J., 521, L133 (2009).
[2] O. Pirali, et al., Astrophys. J., 661, 919 (2007).
[3] M. Steglich, et al., Astrophys. J., 729, 91 (2011).
[4] P. B. Crandall et al., ApJL, 900, L20 (2020).