Understanding Deuterium Fractionation

  • Our Team

  • Dr. Oskar Asvany (PI, PH1)
  • Thomas Salomon (PH1)
  • Philip Schreier (PH1)
  • Matthias Töpfer (PH1)
  • Former members
  • Alexander Stoffels (PH1)
  • Sven Fanghänel (PH1)
  • Lars Kluge (PH1)
  • Sabrina Gärtner (PH1)

A short overview

Project B2 deals with the laboratory investigation of small molecular cations of astrochemical interest using cryogenic ion trapping machines. Building on the novel action spectroscopic methods developed in the last funding periods, one focus is the infrared and (sub)mm-wave spectroscopy of deuterated cations whose spectral fingerprints are not or insufficiently known. As the rotational spectroscopy of the primary deuterated ions (those created by gas-phase exchange collisions of H3+, CH3+ or C2H2+ with HD molecules) has been completed successfully, the project turns its attention to secondary deuterated ions. This spectroscopic knowledge is important for the interpretation of the deuterium fractionation observed during and after the initial cold phases of star formation. Additionally, small fundamental cations containing only hydrogen and helium (e.g. H2He+) will be investigated. 

Understanding deuterium chemistry is a central tool in understanding the different phases of star formation. Therefore project B2 is right at the center topic of the SFB. The results of project B2 are of relevance for the other laboratory astrophysics project B3, since deuteration and understanding the formation of large carbon containing molecules are strongly related. Project A6 uses observations of the molecular deuteration as an important tool to study the earliest, cold phases of star formation and characterizes the physical and chemical conditions of the star forming clumps. In particular, the deuteration of the coldest objects is probed using H2D+ lines studied in this project. Furthermore, the results of the kinetics unraveled in project B2 are of importance for the chemical modeling in project C3.

Selected Publications

In 2018
Asvany, O., Thorwirth, S., Redlich, B., and Schlemmer, S., Spectroscopy of the low-frequency vibrational modes of CH3+, J. Mol. Spectrosc., 2018, 347, 1

Domenech, J. L., Jusko, P., Schlemmer, S., and Asvany, O., The first laboratory detection of Vibration-Rotation Transitions of CH+ and 13CH+ and Improved Measurement of their Rotational Transition Frequencies, Astrophys. J., 2018, 857, 61

In 2017
Domenech, J. L., Schlemmer, S., and Asvany, O., Accurate Frequency Determination of Vibration-Rotation and Rotational Transitions of SiH+, Astrophys. J., 2017, 849, 60

Jusko, P. et al., Double resonance rotational action spectroscopy of cold H2D+ and D2H+, J. Mol. Spectrosc., 2017, 332, 33

Jusko, P. et al.,  High-resolution vibrational and rotational spectroscopy of CD2H+ in a cryogenic ion trap, J. Mol. Spectrosc., 2017, 332, 59

Harju, J. et al., Detection of Interstellar Ortho-D2H+ with SOFIA, Astrophys. J., 2017, 840, 63

Fanghänel, S., Schlemmer, S., and Asvany, O., Optimization of RF multipole ion trap geometries, J. Mol. Spectrosc., 2017, 332, 124

In 2016
Jusko, P., Konietzko, C., Schlemmer, S., and Asvany, O., Frequency comb assisted measurement of fundamental transitions of cold H3+, H2D+ and D2H+, J. Mol. Spectrosc., 2016, 319, 55

Töpfer, M., Jusko, P., Schlemmer, S., and Asvany, O., Double resonance rotational spectroscopy of CH2D+, Astron. Astrophys., 2016, 593, L11

In 2015
Savic, I. et al, Controlled synthesis and analysis of He-H3+ in a 3.7 K ion trap, Mol. Phys., 2015, 113, 15

In 2014
Asvany, O., Brünken, S., Kluge, L., and Schlemmer, S., COLTRAP: a 22-pole trapping machine for spectroscopy at 4 K. Appl. Phys. B, 2014, 114, 203

Brünken, S., Kluge, L., Stoffels, A., et al., Laboratory rotational spectrum of l-C3H+ and confirmation of its astronomical detection. Astrophys. J. Lett., 2014, 783, L4 (co-authors: Asvany, O., Schlemmer, S.)

In 2013
Gärtner, S., Krieg, J., Kleman, A., et al., High-resolution spectroscopy of CH2D+ in a cold 22-pole ion trap. J. Phys. Chem. A, 2013, 117, 9975 (co-authors: Asvany, O., Schlemmer, S.)

In 2012
Asvany, O., Krieg, J., and Schlemmer, S., Frequency comb assisted mid-infrared spectroscopy of cold molecular ions. Rev. Sci. Instr., 2012, 83, 093110

Kluge, L., Gärtner, S., Brünken, S., et al., Transfer of a proton between H2 and O2 . Phil. Trans. Royal Soc. A, 2012, 379, 5041 (co-authors: Asvany, O., Schlemmer, S.)

Grussie, F., Berg, M.H., Crabtree, K.N. et al., The low temperature nuclear spin equilibrium of H3+ in collisions with H2. Astrophys. J., 2012, 759, 21 (co-authors: Gärtner, S., Schlemmer, S.)

In 2010
Asvany, O., Bielau, F., Moratschke, D., et al., A new design of a cryogenic linear radio frequency multipole trap. Rev. Sci. Instr., 2010, 81, 076102 (co-authors: Schlemmer, S.)

In 2008
Asvany, O., Ricken, O., Müller, H.S.P., et al., High-resolution rotational spectroscopy in a cold ion trap: H2D+ and D2H+. Phys. Rev. Lett., 2008, 100, 233004 (co-authors: Schlemmer, S.)