1. 69th ISMS 2014/06/17 Urbana-Champaign Lars Kluge I. Physikalisches Institut Universität zu Köln - Germany LIICG - A NEW METHOD FOR ROTATIONAL AND RO-VIBRATIONAL SPECTROSCOPY AT 4K L. Kluge, A. Stoffels*, S. Brünken, O. Asvany and S. Schlemmer I.Physikalisches Institut, Universität zu Köln, Germany * also: Radboud University Nijmegen, Institute for Molecules and Materials, FELIX Facility

2. 69th ISMS 2014/06/17 Urbana-Champaign Lars Kluge I. Physikalisches Institut Universität zu Köln - Germany Laser Induced Inhibition of Complex Growth – Overview Brünken et al. (ApJL, 783, L4 (2014)) electronic spectrumIR spectrumTHz- / mm-spectrum Asvany et al. (Appl. Phys. B 114, 203 (2014)) Chakrabarty et al. (J. Phys. Chem. Lett., (2013))

3. 69th ISMS 2014/06/17 Urbana-Champaign Lars Kluge I. Physikalisches Institut Universität zu Köln - Germany The FELion Experiment Storage Ion Source 1st Quadrupole Mass Filter 2nd Quadrupole Mass Filter 4K Coldhead22-Pole Trap Daly Type Detector Asvany et al. (Applied Physics B, 114, 203 (2014)) THz- or mm-radiation

4. 69th ISMS 2014/06/17 Urbana-Champaign Lars Kluge I. Physikalisches Institut Universität zu Köln - Germany LIICG Model – Kinetics

5. 69th ISMS 2014/06/17 Urbana-Champaign Lars Kluge I. Physikalisches Institut Universität zu Köln - Germany LIICG Model & Measurement CD + CD + rot. GS rot. exc. J 0 1 k coll. higher rot. states He  CD + k CID k3k3 k’ 3 k’ CID E ≈ 15cm -1 D e ≈ 500cm -1 k (d)ex h He 2  CD + k 3_2 k CID_2 Amano (ApJL, 716, L1-L3 (2010))

6. 69th ISMS 2014/06/17 Urbana-Champaign Lars Kluge I. Physikalisches Institut Universität zu Köln - Germany LIICG – Influence of THz radiation J = 0 J = 1 J = 2 J = 3 CD + rot. GS rot. exc. J 0 1 k coll. higher rot. states He  CD + k CID k3k3 k’ 3 k’ CID k (d)ex h

7. 69th ISMS 2014/06/17 Urbana-Champaign Lars Kluge I. Physikalisches Institut Universität zu Köln - Germany LIICG – Numerical Model set up numerical simulation for coupled rate equations THz power 0.5 measuredcalculatedmeasuredcalculated*measured assumption collisions and radiative pumping are in competition CD + rot. GS rot. exc. J 0 1 k coll. higher rot. states He  CD + k3k3 k’ 3 k CID k’ CID k (d)ex h *Turpin et al. (A&A, 511, A28(2010))

8. 69th ISMS 2014/06/17 Urbana-Champaign Lars Kluge I. Physikalisches Institut Universität zu Köln - Germany Radiation Power [%] (100% = 1µW) LIICG Signal (%) LIICG Numerical Model – Results changing He number density Radiation Power [%] (100% = 1µW) LIICG Signal (%)

9. 69th ISMS 2014/06/17 Urbana-Champaign Lars Kluge I. Physikalisches Institut Universität zu Köln - Germany LIICG Numerical Model – Results II a = 0 a = 0.4 a = 0.6 a = 0.8 Radiation Power [%] (100% = 1µW) LIICG Signal (%)

10. 69th ISMS 2014/06/17 Urbana-Champaign Lars Kluge I. Physikalisches Institut Universität zu Köln - Germany LIICG – Summary & Outlook LIICG is also possible with THz- / mm-radiation –No inhibition of complex growth more measurements for better understanding basic simulation is running –including more detailed kinetics –predictions

11. 69th ISMS 2014/06/17 Urbana-Champaign Lars Kluge I. Physikalisches Institut Universität zu Köln - Germany LIICG – Outlook II idea: measure ro-vibrational transitions (IR) –use this data to fit molecular constants –predict rotational transitions –check predictions with rotational LIICG example: CD 2 H + –measure 91 lines in the IR (with frequency comb) –prediction of rotational lines CD 2 H + 1 11 ← 0 00

12. 69th ISMS 2014/06/17 Urbana-Champaign Lars Kluge I. Physikalisches Institut Universität zu Köln - Germany Acknowledgment – The Cologne Ion Trappers Stephan Schlemmer Sabrina Gärtner Oskar Asvany Alexander Stoffels Christoph Konietzko Sven Fanghänel funding: SFB 956 Dieter Gerlich thanks to: electronical & mechanical workshops Frank Bielau, Peter Stölzgen, Henning Adams & Frank Lewen Sandra Brünken Pavol Jusko Ann-Christin Wallerstein