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FELIX Infrared and THz Spectroscopy research group

Our group develops and uses mass spectrometric techniques in combination with advanced infrared and terahertz spectroscopy. Our main scientific focus is in the field of astrochemistry. We aim to understand the chemical evolution in astrophysical environments, such as interstellar star-forming regions or (exo-) planetary atmospheres, by simulating their conditions in the laboratory.

For this we apply infrared spectroscopy to obtain vibrational fingerprints of molecules to aid their identification in space. The spectroscopic information allows us to identify molecular structures within isomeric mixtures, and thus to unravel and to understand astrochemical reaction kinetics and networks in great detail both in the gas-phase or in ices.

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Latest news & research

Recent Publications

IRFEL selective irradiation of amorphous solid water: from dangling to bulk modes. Stephane Coussan, Jennifer A. Noble, Herma M. Cuppen, B. Redlich and S. Ioppolo: (2022)J. Phys. Chem. A, 126, 2262-2269.

Infrared predissociation spectroscopy of protonated methyl cyanide, CH3CNH+. Aravindh. N. Marimuthu, Frank Huis in 't Veld, S. Thorwirth, B. Redlich and Sandra Brünken: (2021) Journal of Molecular Spectroscopy, 379, 111477-1 - 111477- 8.  [PDF]

Cryogenic messenger-IR Ion spectroscopy study of phenol & aniline molecular ions and of the common fragment ion [C5H6]radical .+ formed by EI-MS. Dennis Zeh, Marcel Bast, Daniël.B. Rap, P.C. Schmid, S. Thorwirth, Sandra Brünken, S. Schlemmer and M Schäfer: (2021) Journal of Molecular Spectroscopy, 378, 111453-1 - 11453-11.

Infrared action spectroscopy of doubly charged PAHs and their contribution to the aromatic infrared bands. S. Banhatti, Julianna Palotás, P. Jusko, B. Redlich, J. Oomens, S. Schlemmer and Sandra Brünken: (2021) A&A, 648, A61-1 - A61-12.  [PDF]

Highly efficient THz four-wave mixing in doped silicon. N. Dessmann, N.H. Le, Viktoria Eless, S. Chick, K. Saeedi, Alberto Perez-Delgado, S.  G Pavlov, A. F. G. v d Meer, K.L. Litvenenko, I. Galbraith, N. V. Abromisov, H. Riemann, C. Pidgeon, G. Aeppli, B. Redlich and B. Murdin: (2021) Light: Science & Applications, 10, 71-1 - 71-6.  [PDF]

Hunting for the elusive methylene radical. A.M. Jacob, K.M. Menten, Yu Gong, P. Bergman, M. Tiwari, Sandra Brünken and O.H. Olofsson: (2021) A&A, 647, A42-1 - A42-24.  [PDF]

Transient transmission of THz metamaterial antennas by impact ionization in a silicon substrate. Matias Bejide, Yejun Li, N. Stavrias, B. Redlich, H. Tanaka, Vu Dinh Lam, Nguyen Thanh Tung and E. Janssens: (2021) Opt. Express, 29, 170-181. [PDF]

Influence of uniaxial stress on phonon-assisted relaxation in bismuth-doped silicon. R.  Kh Zhukavin, S.  G Pavlov, N. Stavrias, K. Saeedi, K. A. Kovalevsky, P.J. Phillips, V. V. Tsyplenkov, N. V. Abromisov, H. Riemann, N. Dessmann, H. W. Hübers and V.  N Shastin: (2020) J. Appl. Phys., 127, 035706-1 - 035706-9. [PDF]

Frequency Tuning of Terahertz Stimulated Emission under the Intracenter Optical Excitation of Uniaxially Stressed Si:Bi. R.  Kh Zhukavin, K. A. Kovalevsky, S.  G Pavlov, N. Dessmann, A. Pohl, V. V. Tsyplenkov, N. V. Abromisov, H. Riemann, H. W. Hübers and V.  N Shastin: (2020) Semiconductor Science and Technology, 54, 969-974.  [PDF]