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Thursday, August 6, 2020 | History

2 edition of An intense slit discharge source of jet-cooled molecular ions and radicals (T[sub rot] < 30 K) found in the catalog.

An intense slit discharge source of jet-cooled molecular ions and radicals (T[sub rot] < 30 K)

An intense slit discharge source of jet-cooled molecular ions and radicals (T[sub rot] < 30 K)

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  • 9 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Molecular ions.,
  • Radicals.,
  • High resolution.,
  • Absorption spectroscopy.,
  • Laser spectroscopy.,
  • Slits.

  • Edition Notes

    StatementDavid T. Anderson ... [et al.].
    Series[NASA contractor report] -- NASA-CR-204804., NASA contractor report -- NASA CR-204804.
    ContributionsAnderson, David T., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15490267M

    USA US08/, USA USA US A US A US A US A US A US A US A US A US A Authority US United States Prior art keywords chamber gas spark sample detector Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Nathanael M. Kidwell, Deepali N. Mehta-Hurt, Joseph A. Korn, Edwin L. Sibert III, Timothy S. Zwier, “Ground and excited state infrared spectroscopy of jet-cooled radicals: Exploring the photophysics of trihydronaphthyl and indenylmethyl.” J. Chem. Phys., (21) ().

    Inter- and circumstellar ices comprise different molecules accreted on cold dust particles. These icy dust grains provide a molecule reservoir where particles can interact and react. As the grain acts as a third body, capable of absorbing energy, icy surfaces in space have a catalytic effect. Chemical reactions are triggered by a number of possible processes; (i) irradiation by light. We present millimeter-wave observations of several molecular ions in the disk around the pre-main-sequence star DM Tau and use these to investigate the ionization fraction in different regions of the disk. New Submillimeter Array (SMA) observations of H{sub 2}D{sup +} J = 1{sub 1,0}-1{sub 1,1}, N{sub 2}H{sup +} J = , and CO J = are.

    Energy (cm-1) Med. Transition λ min (nm) λ max (nm) References; T o = ± gas: Black and Powis, State: 3d 2 A 1 '. free radicals developed in our group.6 The source utilizes an electrical discharge struck in the jet These F/F* atoms collide with jet cooled molecules at a center-of-mass collision energy dictated by the jet velocities, which areH second jet contains F atoms produced in a pulsed mini-slit ( lm]5 mm) discharge source


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An intense slit discharge source of jet-cooled molecular ions and radicals (T[sub rot] < 30 K) Download PDF EPUB FB2

A novel pulsed, slit supersonic discharge source is described for generating intense jet-cooled densities of radicals (> 10 12 / cm 3) and molecular ions (> 10 10 / cm 3) under long absorption path (80 cm), supersonically cooled design confines the discharge region upstream of th supersonic expansion orifice to achieve efficient rotational cooling down to 30 K or by: Get this from a library.

An intense slit discharge source of jet-cooled molecular ions and radicals (T[sub rot] [30 K). [David T Anderson; United States. National Aeronautics and Space Administration.;]. Abstract. A novel pulsed, slit supersonic discharge source is described for generating intense jet-cooled densities of radicals (greater than 10(exp 12)/cu cm) and molecular ions (greater than 10(exp 10)/cu cm) under long absorption path (80 cm), supersonically cooled conditions.

A novel pulsed, slit supersonic discharge source is described for generating intense jet-cooled densities of radicals (> 10 12 / cm 3) and molecular ions (> 10 10 / cm 3) under long absorption path (80 cm), supersonically cooled conditions.

The design confines the discharge region upstream of th supersonic expansion orifice to achieve efficient rotational cooling down to 30 K or by: Frequency modulated discharges are combined with pulsed slit supersonic expansions to provide an intense, long path source of jet-cooled radicals/molecular ions for direct absorption laser spectroscopy.

The high modulation frequency ( kHz) permits lock-in detection of the modulated absorbance signals at sensitivities down to ×10 -7 > absorbance/Hz 1/2 (within 40% Cited by: An intense slit discharge source of jet-cooled molecular ions and radicals (T ot.

A novel pulsed, slit supersonic discharge source is described for generating intense jet-cooled densities of radicals (> / cm3) and molecular ions (> / cm3) under long absorption path. Frequency modulated discharges are combined with pulsed slit supersonic expansions to provide an intense, long path source of jet-cooled radicals/molecular ions for direct absorption laser.

Chem. Rev. All Publications/Website. OR SEARCH CITATIONS. Jet-cooled molecular radicals in slit supersonic discharges: Sub-Doppler infrared studies of methyl radical. An intense slit discharge source of jet-cooled molecular ions and radicals (Trot of jet-cooled molecular ions and ion.

Abstract. Author Institution: JILA National Institute for Standards and Technology, Department of Chemistry and Biochemistry, University of ColoradoThe novel combination of pulsed slit supersonic expansions and pulsed electrical discharges results in a remarkably intense source of jet cooled chemical reactive species in a long path length geometry ideal for near shot noise limited direct.

The novel combination of pulsed slit supersonic expansions and pulsed electrical discharges results in a remarkably intense source of jet cooled chemical reactive species in a long path length geometry ideal for near shot noise limited direct absorption spectroscopy with high resolution tunable lasers.

pathlength. The slit discharge setup generates radicals and ions in high concentrations and the Herriot cell and 4 cm long slit increases the pathlength considerably. These concepts have been used before, including in the other high resolution spectrometer in the group, and are well established as a reliable way to look at radicals and ions.

We present a comparison of two technically distinct methods for the generation of rotationally cold, pulsed supersonic beams of methyl radicals (CH 3): a plate discharge source operating in the glow regime and a dielectric barrier discharge results imply that the efficiency of both sources is comparable and that molecular beams with similar translational and rotational temperatures.

2 stretch modes, verifying jet-cooled conditions [T rot = (8) K] in the slit discharge and demonstrating a (2):1 ratio between the two bands. To further explore this anomaly, we have pursued moderately high-level theoretical calculations utilizing density functional theory (B3LYP) with an aug-cc.

An exception is molecular hydrogen (and deuterium) which has a multi-line spectrum due to its small mass. Identification of molecular radiation is best done with the book by Pearse and Gaydon. Precise wavelengths and transition probabilities for atoms and ions can be found in the NIST database.

It should be kept in mind that the Doppler. The two discharge modes are distinguishable in the determined vibrational and rotational temperatures. In the G-mode discharge, T vib was increased from to K with the increase in the input power, but T rot kept at a constant of ∼ K, which is very close to Guerra et al.’s simulation of the DC discharge with low current.

17 V. Young’s double slit experiment breaks a single light beam into two sources. Would the same pattern be obtained for two independent sources of light, such as the headlights of a distant car. Explain. Suppose you use the same double slit to perform Young’s double slit experiment in air and then repeat the experiment in water.

At the second minimum adjacent to the central maximum of a single-slit diffraction pattern the Huygens wavelet from the top of the slit is out of phase with the wavelet from: A.

a point one-fourth of the slit width from the top B. the midpoint of the slit C. a point one-fourth of the slit width from the bottom of the slit D. the bottom of. An intense slit discharge source of jet-cooled molecular ions and radicals (Trot 30 K) Chemical Physics Letters.

1: Fredericks SY, Jordan KD, Zwier TS. Theoretical characterization of the structures and vibrational spectra of benzene-(H2O)n (n = ) clusters Journal of Physical Chemistry. 1:. Advanced oxidation technologies (AOTs) focusing on nonthermal plasma induced by dielectric barrier discharge are adequate sources of diverse reactive oxygen species (ROS) beneficial for water and wastewater treatment.

In this study, indigo, peroxytitanyl sulphate and terephthalic acid methods were used to approximate the concentrations of O3, H2O2 and OH produced in a double cylindrical.So, the ions would move as shown in Fig.and a detector placed on the outside of a slit at a distance r* could be used to detect ions of a selected m/q ratio by scanning the magnetic sector’s field strength B until those ion’s r value matched r*.Abstract.

After a brief introduction in Sect. we shall expand our knowledge about rotational (microwave) and vibrational (infrared) spectroscopy in Sects. andrespectively, and supplement it with short excursions into infrared Fourier transform spectroscopy (FTIR) and IR action spectroscopy.

In Sect. we turn to the spectroscopy of electronic transitions (VIS, UV and VUV) and.