Alexandra A. Hoops

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The photodissociation dynamics of I3- from 390 to 290 nm (3.18 to 4.28 eV) have been investigated using fast beam photofragment translational spectroscopy in which the products are detected and analyzed with coincidence imaging. At photon energies < or = 3.87 eV, two-body dissociation that generates I- + I2(A 3Pi1) and vibrationally excited I2- (X 2Sigmau+)(More)
We review three photofragmentation detection approaches, describing the detection of (1) vapor-phase mercuric chloride by photofragment emission, (2) vapor-phase nitro-containing compounds by photofragmentation-ionization, and (3) surface-bound organophosphonate compounds by photofragmentation-laser-induced fluorescence.
The photodissociation of mass-selected linear carbon clusters (Cn, n ) 4-6) is studied using fast beam photofragment translational spectroscopy. The photofragment yield (PFY) spectra consist of several continua spanning the whole visible and ultraviolet region. The product mass distributions for dissociation of Cn clusters are dominated by C3 and its(More)
The viability of pulsed laser photofragment emission (PFE) is evaluated for the in situ measurement of vapor-phase mercuric chloride (HgCl(2)) concentration in combustion flue gas. Dispersed emissions from both the Hg (6(3)P(1)) and HgCl (B(2)Sigma(+)) photoproducts are presented, and the dependence of the HgCl(2) PFE signal originating from Hg (6(3)P(1))(More)
The spectroscopy and dissociation dynamics of I3 2 were investigated using fast beam photofragment translational spectroscopy. The photofragment yield of I3 2 from 420 to 240 nm was measured, yielding two broadbands at the same energies as in the absorption spectrum of I3 2 in solution. Photodissociation dynamics measurements performed with two-particle(More)
The photodissociation dynamics of NCO have been examined using fast beam photofragment translational spectroscopy. Excitation of the 10 , 30 , and 10 30 2 transitions of the B̃ 2P←X̃ P band produces N(S)1CO photofragments exclusively, while excitation of the 10 30 3 transition yields primarily N(D)1CO photoproducts. The translational energy @P(ET)#(More)
The photodissociation spectroscopy and dynamics resulting from excitation of the B (2)A(")<--X (2)A(") transition of CH(2)CFO have been examined using fast beam photofragment translational spectroscopy. The photofragment yield spectrum reveals vibrationally resolved structure between 29 870 and 38 800 cm(-1), extending approximately 6000 cm(-1) higher in(More)
The effects of collisional quenching on photofragment emission (PFE) detection of vapor-phase HgCl(2) in combustion flue gas constituents are investigated. Exciting HgCl(2) via the 1(1)Pi(u)<--1(1)Sigma(g)+ transition, time-resolved measurements of emission from the Hg(6(3)P(1)) daughter in buffer-gas mixtures of N(2), O(2), and CO(2) indicate that the(More)
A real-time, noninvasive approach for detecting trace amounts of vapor-phase mercuric chloride (HgCl(2)) in combustion flue gas is demonstrated using a near-infrared pulsed fiber amplifier that is frequency converted to the ultraviolet. Excitation of the HgCl(2) ([see text]) transition at 213 nm generates 253.7 nm emission from the Hg (6(3)P(1))(More)