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Chemical Probing Spectroscopy of H 3 + above the barrier to linearity Holger Kreckel* Max-Planck-Institut für Kernphysik, Heidelberg, Germany * Present.

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Presentation on theme: "Chemical Probing Spectroscopy of H 3 + above the barrier to linearity Holger Kreckel* Max-Planck-Institut für Kernphysik, Heidelberg, Germany * Present."— Presentation transcript:

1 Chemical Probing Spectroscopy of H 3 + above the barrier to linearity Holger Kreckel* Max-Planck-Institut für Kernphysik, Heidelberg, Germany * Present address: University of Illinois at Urbana-Champaign

2 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg Cryogenic ion trapTSR storage ring introduction 22 Pol trap, a few words on H 3 + spectroscopy, chemical probing scheme, spectroscopy above the barrier, perspectives. Outline

3 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg D. Gerlich, Physica Scripta T59, 256 (1995) 22-pole ion trap

4 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg Quadrupole 22-Pole Field geometry

5 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg 22-pole ion trajectories

6 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg Trap Setup

7 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg energy [cm -1 ] α [rad] 4600 cm -1 detector ArH + H3+H3+ He, Ar H3+H3+ ArH + +H 2 - 0.57 eV H 3 + +Ar H 3 + (v=3) + Ar ArH + + H 2 + 0.35 eV diode laser IR laser Chemical probing principle

8 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg Manipulating the nuclear spin of H 3 + H.Kreckel et al., J. Phys.: Conf Ser. 88, 012064 (2007) T kin ~ 67K T para ~ 67K T kin ~ 67K T para ~ 67K ~40% ~ 60% ~40% ~60%

9 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg Sample H 3 + line

10 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg High sensitivity spectroscopy: above the barrier to linearity E [cm -1 ] 60° 180° Ti:Sa Laser α α [rad]

11 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg Spectroscopy setup

12 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg Motivation: The rich Predissocation Spectrum of H 3 + -In the eighties Carrington and coworkers found 26000 discreet lines in the wavelength region from 872-1094 cm -1. All the way to dissociation …?

13 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg Spectroscopy above the barrier to linearity Theory: J. Tennyson, A. Alijah

14 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg List of measured transitions

15 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg All the way to dissociation …? Kreckel et al, JCP 129, 164312 (2008)

16 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg Max Berg, Dennis Bing, Sascha Reinhardt Holger Kreckel Annemieke Petrignani Andreas Wolf Max-Planck-Institut für Kernphysik Charles University Prague Jochen Mikosch, Roland Wester Radek Plašil, Juraj Glosík Dieter Gerlich Albert-Ludwigs- Universität Freiburg Technische Universität Chemnitz Sascha Reinhardt Dennis BingMax Berg Annemieke Petrignani HK Collaboration

17 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg Perspectives Ion source ion trap venture into the visible/dye laser regime, improve differential pumping, prepare a 2-color scheme for action spectroscopy in storage rings. Breaking News: first lines above 15000 cm -1 observed A. Petrignani, priv. comm.

18 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg

19 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg

20 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg

21 Chemical probing spectroscopy of H 3 + above the barrier to linearity Ohio Spectroscopy, June 23 rd 2009 Holger Kreckel / MPI-K Heidelberg Measurement procedure

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