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Submillimeter-wave lines of H 2 D + and D 2 H + as probes into chemistry in cold dark clouds

Submillimeter-wave lines of H 2 D + and D 2 H + as probes into chemistry in cold dark clouds. T. Amano Institute for Astrophysics and Planetary Sciences Ibaraki University. In this talk. Overview of spectroscopy of D 2 H + and H 2 D + TuFIR lines of H 2 D +

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Submillimeter-wave lines of H 2 D + and D 2 H + as probes into chemistry in cold dark clouds

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  1. Submillimeter-wave lines ofH2D+ and D2H+ as probes into chemistry in cold dark clouds T. Amano Institute for Astrophysics and Planetary Sciences Ibaraki University

  2. In this talk • Overview of spectroscopy of D2H+and H2D+ • TuFIR lines of H2D+ • H5+ and its deuterated species

  3. Spectroscopy of H2D+ and D2H+ Amano & Hirao, J. Mol. Spectrosc. 233, 7 (2005) IR • Shy, Farley, Wing (1981): Ion beam • Amano & Watson (1984), Amano (1985): 1 band (H2D+) • Lubic & Amano (1984): 1 band (D2H+) • Foster et al. (1986): 2 /3 bands (H2D+) • Foster, McKellar, Watson. (1986): 2 /3 bands (D2H+ ) • Polyansky & McKellar (1990): All available data were fitted together to improve molecular constants. (D2H+)

  4. mm-, sub-mm, FIR • Bogey et al. (1984): 110-111 H2D+ (372.4 GHz) Warner et al.(1984): • Saito, Kawaguchi, Hirota (1985): 220-221 H2D+ (156.0 GHz) • Jennings, Demuynck, Banek, Evenson (unpublished): 101-000 H2D+ (1370.1 GHz) 111-000 D2H+ (1476.6 GHz) 220-211 D2H+ (1370.1 GHz) • Hirao & Amano (2003): 110-101 D2H+ (691.7 GHz) • Amano & Hirao (2005): 321-322 H2D+ (646.4 GHz)

  5. Theoretical work Carney and Porter(1977) Tennyson, Polyansky and coworkers carried out very high level ab initio calculations, and interactions between theory and experiments were often very crucial in assigning the spectra and in deriving the accurate spectroscopic constants . See for example, Polyansky and Tennyson, JCP,110, 5056(1999)

  6. Ibaraki sub-mm system • Russian BWO(Backward-wave oscillator) 270-860 GHz ~1 mW stabilized, using double phase-lock loop • Double modulationtechnique frequency-discharge frequency-magnetic field extended negative glow discharge

  7. Double modulation sub-mm system at Ibaraki (University of Waterloo)

  8. Submillimeter-wave system in Ibaraki

  9. Experimental Details • Extended negative glow discharge source. (Magnetic field: 200G). • Double modulation. • H2/D2/Ar = 4 /2 /17 mTorrfor H2D+ =3 /2 /17 mTorr for D2H+ I = 8 mA, T ~ 77 K

  10. Ap.J. Lett. 597, L85-L87(2003). 691660.440(20) MHz

  11. TuFIR Spectrometer ( Toyama University )

  12. Energy Level Diagram of H2D+ Energy Level Diagram of H2D+

  13. Hyperfine structure of H2D+ and D2H+ H2D+ Jensen et al. Mol. Phys. 91, 319(1997) H2D+ D2H+

  14. H5+ Yamaguchi, Gaw, Remington, Schaefer. J. Chem. Phys. 80, 5072(1987) Xie, Braams, Bowman. J. Chem. Phys.122, 224307(2005)

  15. 4 low energy conformers of H5+ 1-C2v 3-C2v 4-D2h 2-D2d

  16. Financial support • Ministry of Education, Science, and Culture • of Japan • Japan Society for Promotion of Science(JSPS) • Japan Space Forum(JSF) • JEM/SMILES Project

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