scholarly journals HIGH-RESOLUTION SPECTROSCOPIC STUDIES OF REACTION INTERMEDIATES RELEVANT TO ATMOSPHERIC CHEMISTRY

2014 ◽  
Author(s):  
Yasuki Endo
Keyword(s):  
High Resolution ◽  
Atmospheric Chemistry ◽  
Spectroscopic Studies ◽  
Reaction Intermediates

Synchrotron radiation and long path cryogenic cells: New tools and results for modelling chlorinated compounds absorption in the 8-12µm atmospheric window

2020 ◽  
Author(s):  
Laurent Manceron
Keyword(s):  
High Resolution ◽  
Atmospheric Chemistry ◽  
Broad Band ◽  
Spectroscopic Studies ◽  
Heterogeneous Reactions ◽  
Chlorine Nitrate ◽  
Synchrotron Source ◽  
Fourier Transform Spectrometry ◽  
Vibrational Levels ◽  
Stratospheric Clouds

<p> </p><p><strong>Anusanth Anantharajah<sup>a</sup>, Fridolin Kwabia Tchana<sup>a</sup>, Jean-Marie Flaud<sup>a</sup> , Pascale Roy<sup>b</sup> and Laurent Manceron<sup>b,c</sup></strong></p><ul><li>a- Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), UMR CNRS 7583, <br>Université de Paris et Université Paris-Est Créteil, Institut Pierre Simon Laplace, <br>61 Avenue du Général de Gaulle, 94010 Créteil Cedex, France.</li> <li>b- Synchrotron SOLEIL, AILES Beamline, L’Orme des Merisiers, Saint-Aubin F-91192, France.</li> <li>c-  Sorbonne Université, CNRS, MONARIS, UMR 8233, 4 place Jussieu, F-75005 Paris, France. </li> </ul><p> </p><p>Nitryl chloride (ClNO<sub>2</sub>) and Chlorine Nitrate are molecules of great interest for atmospheric chemistry since these are produced by heterogeneous reactions, in the marine troposphere, between NaCl sea-salt aerosols or ClO and gaseous N<sub>2</sub>O<sub>5</sub> [1,2], and on polar stratospheric clouds, between N<sub>2</sub>O<sub>5</sub> and solid HCl [3,4].</p><p> </p><p>Many high-resolution spectroscopic studies in the microwave and mid-infrared regions are available. However, these molecules present low-lying vibrational levels and thus numerous hot bands in the regions of the NOx stretching and bending mode absorptions in the 8-12 µm atmospheric transparency window which could serve for remote sensing and quantification of these species.</p><p>Fourier Transform Spectrometry is a useful technique to observe broad band high resolution spectra (0.001 cm<sup>-1</sup>) of these molecules and a significant advantage is gained by combining interferometry with the high brightness of a synchrotron source [5]. At SOLEIL we have developed specific instrumentation to study such reactive molecules and a few results concerning chlorine-containing compounds will be presented.</p><ol><li>B. J. Finlayson-Pitts, M. J. Ezell, and J. N. Pitts Jr, Nature <strong>337</strong>, 241-244 (1989).</li> <li>W. Behnke, V. Scheer, and C. Zetzsch, J. Aerosol Sci. <strong>24</strong>, 115-116 (1993).</li> <li>. M. A. Tolbert, M. J. Rossi, and D. M. Golden, Science <strong>240</strong>, 1018-1021 (1988).</li> <li>M. T. Leu, Geophys. Res. Lett. <strong>15</strong>, 851-854 (1988).</li> <li> J-M. Flaud, A. Anantharajah, F. Kwabia Tchana, L. Manceron, J. Orphal, G. Wagner, and M. Birk, J Quant Spectrosc Radiat Transf <strong>224</strong>, 217-221 (2019).</li> </ol><p> </p>

The high-resolution spectroscopy of dissociating molecules

1990 ◽  
Vol 332 (1625) ◽  
pp. 297-307 ◽  
Keyword(s):  
High Resolution ◽  
Energy Flow ◽  
Energy State ◽  
Reaction Dynamics ◽  
Theoretical Models ◽  
Spectroscopic Studies ◽  
High Resolution Spectroscopy ◽  
Bond Breaking ◽  
Vibrational Levels ◽  
Dynamical Constraints

Results from spectroscopic studies of the vibrational levels of dissociating molecules and from state-selected, state-resolved photofragmentation spectroscopy are presented. The extent of energy flow among the modes of a molecule is explored through the couplings, or lack thereof, revealed by high-resolution spectroscopy. The dynamics of energy flow during bond breaking are revealed by photofragment excitation spectroscopy and by product energy state distributions. These completely resolved data provide sensitive tests of dynamical constraints such as vibrational or rotational adiabaticity and thus of theoretical models for unimolecular reaction dynamics.

High resolution rotational spectroscopy of elusive molecules at the Center for Astrochemical Studies (CAS@MPE)

2019 ◽  
Vol 15 (S350) ◽  
pp. 375-376
Author(s):  
Silvia Spezzano ◽  
Valerio Lattanzi ◽  
Jacob Laas ◽  
Johanna Chantzos ◽  
Luca Bizzocchi ◽  
...  
Keyword(s):  
High Resolution ◽  
Spectroscopic Studies ◽  
Rotational Spectroscopy ◽  
Max Planck ◽  
Unstable Molecules

AbstractThe laboratories at the Centre for Astrochemical Studies at the Max Planck Institute for Extraterrestrial Physics are devoted to spectroscopic studies of molecules of astrophysical relevance. In particular, in this paper we report on the two experiments that can produce and probe unstable molecules, like radicals and ions.

scholarly journals Interferometric Observations of Mira Variables

2003 ◽  
Vol 210 ◽  
pp. 367-376
Author(s):  
G. Van Belle ◽  
R. R. Thompson ◽  
M.J. Creech-Eakman
Keyword(s):  
High Resolution ◽  
Observational Data ◽  
Atmospheric Chemistry ◽  
Spherical Symmetry ◽  
Atmospheric Dynamics ◽  
Pulsating Stars ◽  
Mira Variables ◽  
Cool Stars ◽  
Phase Lags ◽  
New Generation

Milliarcsecond resolution observations of cool stars are becoming increasingly common and sophisticated as recent advances in telescope technology mature. To varying degrees, these observations rely up on stellar models for interpretation of their data, while at the same time present particular challenges to those models. Indications of departures from spherical symmetry are beginning to be observed as increasingly rich image information is obtained by a new generation of interferometers. Examination the subtle variations of wavelength-specific sizes exhibits rich structure, connected to the atmospheric chemistry. For the pulsating stars, such as Mira variables, that structure varies with time, with the phase lags between the various sizes being connected to the atmospheric dynamics. Complex morphologies associated with atmospheric winds have been revealed with these high resolution experiments. A review of these recent results will be presented, concentrated on their implications upon stellar modelling, and the prospects for future observational data.

scholarly journals High-resolution spectroscopic studies of ultra metal-poor stars found in the LAMOST survey

2015 ◽  
Vol 67 (5) ◽  
pp. 84 ◽  
Author(s):  
Haining Li ◽  
Wako Aoki ◽  
Gang Zhao ◽  
Satoshi Honda ◽  
Norbert Christlieb ◽  
...  
Keyword(s):  
High Resolution ◽  
Spectroscopic Studies
Sign in / Sign up

Export Citation Format

Share Document