Design and characterization of late-mixing flash pyrolytic reactor molecular-beam source

Kim, Hahkjoon; Dooley, Kristin S.; Johnson, Elizabeth R.; North, Simon W.
December 2005
Review of Scientific Instruments;Dec2005, Vol. 76 Issue 12, p124101
Academic Journal
We report on the design and characterization of an intense pulsed beam source for the generation of expansion-cooled radical species. The source combines both dual pulsed valve late mixing for coexpansion of reactive gases with a pyrolytic end nozzle as a flash kinetic reactor. As a demonstration of the source we present evidence of BrO and ClO radical production and subsequent photodissociation studies of these species using velocity map ion imaging. The radicals are characterized by a rotational temperature of 150±40 K although substantially lower temperatures should be possible.


Related Articles

  • Photodissociation of nitrous oxide starting from excited bending levels. Kawamata, Hiroshi; Kohguchi, Hiroshi; Nishide, Tatsuhiro; Suzuki, Toshinori // Journal of Chemical Physics;10/7/2006, Vol. 125 Issue 13, p133312 

    The photodissociation dynamics of N2O in the wavelength region of 203–205 nm was studied by velocity map ion imaging. A speed resolution of 0.8% was obtained using standard projection imaging and subpixel centroiding calculations. To investigate N2O dissociation starting from the excited...

  • Slice imaging of photodissociation of spatially oriented molecules. Lipciuc, M. Laura; van den Brom, Alrik J.; Dinu, Laura; Janssen, Maurice H. M. // Review of Scientific Instruments;Dec2005, Vol. 76 Issue 12, p123103 

    An electrostatic ion lens to spatially orient parent molecules and to image the angular distribution of photofragments is presented. Photodissociation of laboratory-oriented molecules makes it possible to study the dynamics of the dissociation process in more detail compared to photodissociation...

  • The electronic state-selective photodissociation of CH2BrI at 248, 210, and 193 nm. Butler, L. J.; Hintsa, E. J.; Shane, S. F.; Lee, Y. T. // Journal of Chemical Physics;2/15/1987, Vol. 86 Issue 4, p2051 

    The primary photodissociation channels of CH2BrI following excitation at 193.3, 210, and 248.5 nm have been studied with the crossed laser-molecular beam technique. Product translational energy distributions and polarization dependences were derived for the primary dissociation processes...

  • Photodissociation dynamics in “hyper-rovibronic” detail: Exploring the potential of millimeter/submillimeter-wave spectroscopy in molecular reaction dynamics experiments. Duffy, Liam M. // Review of Scientific Instruments;Sep2005, Vol. 76 Issue 9, p093104 

    Over the years, many techniques for studying molecular reaction dynamics have been developed and fine-tuned to probe chemical dynamics at an ever-increasing level of detail. Unfortunately, this progress has frequently come at the price of high experimental cost and great complexity. In this...

  • Full characterization of an intense pulsed hyperthermal molecular beam. Watanabe, D.; Che, D.-C.; Fukuyama, T.; Hashinokuchi, M.; Teraoka, Y.; Kasai, T. // Review of Scientific Instruments;May2005, Vol. 76 Issue 5, p055108 

    A molecular beam technique for generating an intense pulsed hyperthermal molecular beam (pulsed HTMB) was developed. The beam source consists of a pulse valve, a cooling-water bottle that protects the pulse valve from heat transfer of the high temperature nozzle, and a nozzle with a heater. The...

  • Multisample matrix-assisted laser desorption source for molecular beams of neutral peptides. Lupulescu, C.; Abd El Rahim, M.; Antoine, R.; Barbaire, M.; Broyer, M.; Dagany, X.; Maurelli, J.; Rayane, D.; Dugourd, Ph. // Review of Scientific Instruments;Dec2006, Vol. 77 Issue 12, p125102 

    We developed and tested a multisample laser desorption source for producing stable molecular beams of neutral peptides. Our apparatus is based on matrix-assisted laser desorption technique. The source consists of 96 different targets which may be scanned by a software control procedure. Examples...

  • Production of a slit skimmer for use in cold supersonic molecular beams. Subramanian, Ranga; Sulkes, Mark // Review of Scientific Instruments;Jan2008, Vol. 79 Issue 1, p016101 

    Cold molecular beams generated by skimming pulsed supersonic gas expansions normally employ conical skimmers. The use of slit shaped skimmers instead of conical skimmers can afford significant signal enhancements. At this time, however, slit shaped skimmers are not available commercially. We...

  • Formation of the CH fragment in the 193 nm photodissociation of CHCl. Seung Keun Shin; Dagdigian, Paul J. // Journal of Chemical Physics;2/14/2008, Vol. 128 Issue 6, p064309 

    The CH fragment from the 193 nm photodissociation of CHCl is observed in a molecular beam experiment. This fragment is formed in the higher-energy dissociation pathway, the lower pathway involving formation of CCl. Both the CHCl parent molecule and the CH fragment were detected by laser-induced...

  • Bond-selective photodissociation of partially deuterated ammonia molecules: Photodissociations of vibrationally excited NHD[sub 2] in the 5ν[sub NH] state and NH[sub 2]D in the 5ν[sub ND] state. Akagi, Hiroshi; Yokoyama, Keiichi; Yokoyama, Atsushi // Journal of Chemical Physics;3/8/2004, Vol. 120 Issue 10, p4696 

    Ultraviolet photodissociation of NHD[sub 2] excited to the fourth overtone state of the NH stretching mode (5ν[sub NH]) and NH[sub 2]D excited to that of the ND stretching mode (5ν[sub ND]) has been investigated by using a crossed laser and molecular beams method. Branching ratio between...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics