Action spectroscopy of and D2H+ using overtone excitation

The ion and its deuterated isotopologues H2D+, D2H+ and play an important role in astrophysical and laboratory plasmas. The main challenge for understanding these ions and their interaction at low temperatures are state-specific experiments. This requires manipulation and a simple but efficient in situ characterization of their low-lying rotational states. In this contribution we report measurements of near infrared (NIR) absorption spectra. Required high sensitivity is achieved by combining liquid nitrogen cooled plasma with the technique of NIR cavity ringdown absorption spectroscopy. The measured transition frequencies are then used for exciting cold ions stored in a low-temperature 22-pole radiofrequency ion trap. Absorption of a photon by the stored ion is detected by using the laser-induced reactions technique. As a monitor reaction, the endothermic proton (or deuteron) transfer to Ar is used in our studies. Since the formed ArH+ (or ArD+) ions are detected with near unit efficiency, the stored ions can be characterized very efficiently, even if there are just a few of them.

[1]  R. Plašil,et al.  Near infrared second overtone cw-cavity ringdown spectroscopy of H2D+ ions , 2006 .

[2]  J. Tennyson,et al.  Near infrared second overtone cw-cavity ringdown spectroscopy of D2H+ ions , 2006 .

[3]  D. A. Orlov,et al.  High-resolution dissociative recombination of cold H3+and first evidence for nuclear spin effects. , 2005, Physical review letters.

[4]  T. Hirao,et al.  Accurate rest frequencies of submillimeter-wave lines of H2D+ and D2H+ , 2005 .

[5]  R. Wester,et al.  Towards state selective measurements of the H3+ dissociative recombination rate coefficient , 2005 .

[6]  È. Roueff.  Microphysics and astrophysical observations: The molecular perspective , 2005 .

[7]  P. Macko,et al.  Recombination studies in a He-Ar-H2 plasma , 2005 .

[8]  P. Macko,et al.  The recombination of spectroscopically identified H3+ (v=0) ions with electrons , 2005 .

[9]  R. Wester,et al.  Action spectroscopy and temperature diagnostics of H+ 3 by chemical probing. , 2004, The Journal of chemical physics.

[10]  J. Tennyson,et al.  Rovibrational relaxation model for H3+ , 2004 .

[11]  T. Millar,et al.  The chemistry of multiply deuterated species in cold, dense interstellar cores , 2004 .

[12]  J. Tennyson,et al.  Deuterated hydrogen chemistry: partition functions, equilibrium constants and transition intensities for the H+3 system , 2004, astro-ph/0406503.

[13]  R. Johnsen,et al.  Afterglow studies of H3+(v=0) recombination using time resolved cw-diode laser cavity ring-down spectroscopy , 2004 .

[14]  C. Vastel,et al.  Detection of D2H+ in the Dense Interstellar Medium , 2004, astro-ph/0403537.

[15]  Daniele Romanini,et al.  Two schemes for trace detection using cavity ringdown spectroscopy , 2004 .

[16]  M. Gerin,et al.  Detection of doubly deuterated ammonia in L134N , 2004 .

[17]  P. Kudrna,et al.  The recombination of and ions with electrons in hydrogen plasma: dependence on temperature and on pressure of H2 , 2003 .

[18]  T. Hirao,et al.  Laboratory Submillimeter-Wave Detection of D2H+: A New Probe into Multiple Deuteration? , 2003 .

[19]  C. Vastel,et al.  First Detection of Doubly Deuterated Hydrogen Sulfide , 2003, astro-ph/0307221.

[20]  J. Tennyson,et al.  Zero point energy of H$_{\mathsf{3}}^{\vec +}$ and its deuterated isotopomers , 2003 .

[21]  J. Tennyson,et al.  Zero point energy of H + and its deuterated isotopomers , 2003 .

[22]  T. Millar,et al.  Enhanced Deuterium Fractionation in Dense Interstellar Cores Resulting from Multiply Deuterated H3+ , 2003 .

[23]  C. Vastel.  FIRST DETECTION OF DOUBLY DEUTERATED SULFIDE , 2003 .

[24]  È. Roueff,et al.  H3++HD↔H2D++H2: low-temperature laboratory measurements and interstellar implications , 2002 .

[25]  S. Schlemmer,et al.  Laser induced reactions in a 22-pole ion trap: C2H2++hν3+H2→C2H3++H , 2002 .

[26]  P. Kudrna,et al.  Advanced integrated stationary afterglow method for experimental study of recombination of processes of H3+ and D3+ ions with electrons , 2002 .

[27]  J. Tennyson,et al.  Beyond the Born–Oppenheimer approximation: High-resolution overtone spectroscopy of H2D+ and D2H+ , 2002 .

[28]  P. Kudrna,et al.  Recombination of D3+ ions in the afterglow of a He-Ar- D2 plasma. , 2002, Physical Review Letters.

[29]  P. Kudrna,et al.  Experimental study of recombination of H3+ ions with electrons relevant for interstellar and planetary plasmas , 2001 .

[30]  P. Kudrna,et al.  The recombination of H3+ ions with electrons: dependence on partial pressure of H2 , 2000 .

[31]  T. Geballe.  H+3 between the stars , 2000, Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences.

[32]  T. Millar,et al.  The role of H2D+ in the deuteration of interstellar molecules , 2000, Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences.

[33]  Daniele Romanini,et al.  Diode laser cavity ring down spectroscopy , 1997 .

[34]  J. Tennyson,et al.  Spectroscopic properties of the H{sup +}{sub 3} molecule: A new calculated line list , 1996 .

[35]  T. Oka,et al.  Near infrared 3ν2 overtone band of H+3 , 1994 .

[36]  A. Eyre-Walker.  A recombination , 1990, Nature.