Bradley F . Parsons, PhD

Associate Professor

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Contact

BradParsons@creighton.edu
College of Arts and Sciences
Chemistry
Biochemistry
Chemistry Faculty
HLSB - Hixson Lied Science Building - 264

Bradley F . Parsons, PhD

Associate Professor

Research Focus

I am interested in the photochemistry of small gas phase complexes.  In my lab, a complex between two gas phase species is formed in a pulsed supersonic expansion.  The supersonic expansion cools internal molecular motions and may condense species into small clusters.  The resulting molecular beam is skimmed and passed into a mass spectrometer that uses conventional velocity map imaging (VMI) ion optics.  Inside the VMI ion optics, the molecular beam is intersected by a tunable pulsed laser that photolyzes the complex resulting in a variety of photofragments.  The photofragments are then ionized by the same laser pulse and the resulting cations are projected onto a 2D position sensitive detector.  Ions impact the detector according to their center-of-mass velocity from the original photodissociation and an image of the detector is recorded using a CCD.  The 2D image corresponds to the Abel transform of the original 3D photofragment distribution.  Thus, from the 2D image, the original 3D center-of-mass velocity distribution is obtained and then converted into a center-of-mass recoil kinetic energy distribution P(ET).  The resulting P(ET) contains information on the internal state(s) of the partner fragment formed during photolysis of the complex.

Department

Chemistry and Biochemistry

Position

Associate Professor

Articles

  • Parsons Bradley F., etal Erratum 2007

Publications

  • ACS omega
    Parsons Bradley F., etal Velocity Map Imaging of NO (A) from Photodissociation of the Ar-NO Complex 2025
  • The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory
    Parsons Bradley F, etal Ultraviolet Excitation of M-O2 (M = Phenalenone, Fluorenone, Pyridine, & Acridine) Complexes Resulting in 1O2 2024
  • The Journal of chemical physics
    Krogmeier Timothy J., etal Characterizing the origin band spectrum of isoquinoline with resonance enhanced multiphoton ionization and electronic structure calculations
    159:13 2023
  • The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory
    Parsons Bradley F., etal Singlet O-2 from Ultraviolet Excitation of the Quinoline-O-2 Complex
    127:23, p. 4957 - 4963 2023
  • The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory
    Parsons Bradley F., etal NO (A) Rotational State Distributions from Photodissociation of the N-2-NO Complex
    126:34, p. 5729 - 5737 2022
  • Journal of Physical Chemistry A
    Parsons Bradley F., etal Anisotropy Measurements from the Near-Threshold Photodissociation of the N2-NO Complex
    126:8, p. 1386 - 1392 2022
  • Journal of Physical Chemistry A
    Parsons Bradley F., etal Singlet O2Produced by Ultraviolet Dissociation of the β-ionone-O2Complex
    125:39, p. 8649 - 8657 2021
  • Journal of Physical Chemistry A
    Parsons Bradley F., etal Photodissociation of the N2-NO Complex between 225.8 and 224.0 nm
    125:16, p. 3406 - 3414 2021
  • Journal of Physical Chemistry A
    Parsons Bradley F., etal Investigation of O2-X (X = Pyrrole or Pyridine) Cluster Photodissociation near 226 nm
    124:49, p. 10152 - 10161 2020
  • Journal of Chemical Physics
    Sheehan Sean M., etal Characterization of cyclic and linear C3H- and C 3H via anion photoelectron spectroscopy
    128:3 2008
  • Journal of Chemical Physics
    Sheehan Sean M., etal Anion photoelectron spectroscopy of C5 H-
    128:17 2008
  • Physical Chemistry Chemical Physics
    Parsons Bradley F., etal Anion photoelectron imaging of deprotonated thymine and cytosine
    9:25, p. 3291 - 3297 2007
  • Parsons B. F, etal Probing spin-orbit quenching in Cl (2P) + H2 via crossed molecular beam scattering 2006
  • Journal of Physical Chemistry A
    Meloni Giovanni, etal Spectroscopic investigation of Al 2N and its anion via negative ion photoelectron spectroscopy
    110:10, p. 3527 - 3532 2006
  • Journal of Chemical Physics
    Parsons Bradley F., etal Photoelectron imaging of I2̄ at 5.826 eV
    125:24 2006
  • Journal of Chemical Physics
    Sheehan Sean M., etal Spectroscopic characterization of the ground and low-lying electronic states of Ga 2N via anion photoelectron spectroscopy
    124:6 2006
  • Journal of Chemical Physics
    Parsons Bradley F., etal An investigation of nonadiabatic interactions in Cl (Pj2) + D2 via crossed-molecular-beam scattering
    122:17 2005
  • Journal of Physical Chemistry A
    Parsons Bradley F., etal Photodissociation dynamics of ArNO clusters
    108:45, p. 9742 - 9749 2004
  • , Non adiabatic dynamics in the C1 + D2 systems 2004
  • Journal of Physical Chemistry A
    Parsons Bradley F., etal On the dissociation of van der Waals clusters of X2-cyclohexane (X = O, Cl) following charge-transfer excitation in the ultraviolet
    107:49, p. 10544 - 10553 2003
  • Journal of Chemical Physics
    Clegg Samuel M., etal Photodissociation dynamics of dicyclopropyl ketone at 193 nm
    119:14, p. 7222 - 7236 2003
  • Chemical Physics Letters
    Wade Elisabeth A., etal Photochemistry of chloropicrin in cryogenic matrices
    365:5-6, p. 473 - 479 2002
  • Journal of Chemical Physics
    Parsons B. F., etal H-atom high-n Rydberg time-of-flight spectroscopy of C-H bond fission in acrolein dissociated at 193 nm
    117:17, p. 7889 - 7895 2002
  • Molecular Physics
    Parsons Bradley F., etal Theoretical investigation of the transition states leading to HCL elimination in 2-chloropropene
    100:6, p. 865 - 874 2002
  • Journal of Chemical Physics
    Mueller Julie A., etal Competing isomeric product channels in the 193 nm photodissociation of 2-chloropropene and in the unimolecular dissociation of the 2-propenyl radical
    114:10, p. 4505 - 4521 2001
  • Journal of Physical Chemistry A
    Parsons B. F., etal Emission spectroscopy of dissociative allyl iodide and aHyl alcohol excited at 199.7 nm
    104:46, p. 10669 - 10674 2000
  • Chemical Physics Letters
    Parsons Brad, etal A combined experimental and theoretical study of resonance emission spectra of SO2(C̃ 1B2 )
    320:5-6, p. 499 - 506 2000
  • Journal of Chemical Physics
    Parsons B. F., etal Emission spectroscopy of photodissociating N2O4 excited near 200 nm to the πnb,Oπ*NO2/nσ*N-N avoided crossing
    111:18, p. 8486 - 8495 1999
  • Langmuir
    Zehner Robert W., etal Tuning the Work Function of Gold with Self-Assembled Monolayers Derived from X-[C6H4-C≡C-]nC6H 4-SH (n = 0, 1, 2; X = H, F, CH3, CF3, and OCH3)
    15:4, p. 1121 - 1127 1999

Grants

  • RARE-1: Singlet O2 from van der Waals Complexes and the Competition Between Product Channels/Sponsor: National Science Foundation/NSF

  • Formation and Quenching of Reactive Combustion Species/Sponsor: University of Nebraska at Omaha/UNO

  • Oxygen Products from Ultraviolet Photodissociation of the O2-NO Bimolecular Complex/Sponsor: CURAS Summer Faculty Research Fellowship