scholarly journals Sensitive quantum state selective detection of H2O and D2O by (2+1)‐resonance enhanced multiphoton ionization

1986 ◽  
Vol 85 (12) ◽  
pp. 6914-6922 ◽  
Author(s):  
Gerard Meijer ◽  
J. J. ter Meulen ◽  
Peter Andresen ◽  
Anette Bath
Keyword(s):  
Quantum State ◽  
Multiphoton Ionization ◽  
Selective Detection

scholarly journals A 1 + 1′ resonance-enhanced multiphoton ionization scheme for rotationally state-selective detection of formaldehyde via the à 1A2 ← X̃ 1A1 transition

2016 ◽  
Vol 18 (32) ◽  
pp. 22355-22363 ◽  
Author(s):  
G. Barratt Park ◽  
Bastian C. Krüger ◽  
Sven Meyer ◽  
Alec M. Wodtke ◽  
Tim Schäfer
Keyword(s):  
Multiphoton Ionization ◽  
Rotational State ◽  
Selective Detection ◽  
Ionization Scheme ◽  
Sensitive Determination

The new 1 + 1′ REMPI scheme is well-suited for sensitive determination of rotational state distributions in formaldehyde.

scholarly journals Photolysis of ClNO adsorbed on MgO(100)

1994 ◽  
Vol 72 (3) ◽  
pp. 737-744 ◽  
Author(s):  
L. Hodgson ◽  
G. Ziegler ◽  
H. Ferkel ◽  
H. Reisler ◽  
C. Wittig
Keyword(s):  
Surface Temperature ◽  
Gas Phase ◽  
Degrees Of Freedom ◽  
Energy Surface ◽  
Multiphoton Ionization ◽  
Pulsed Laser ◽  
Selective Detection ◽  
Repulsive Potential ◽  
Defect Sites ◽  
Rotational Degrees Of Freedom

The 365 nm pulsed laser photolysis of nitrosyl chloride adsorbed on a rough MgO(100) surface at 90 K has been studied. Mass spectrometric detection was used to record time-of-flight (TOF) spectra by monitoring Cl+ and NO+. These ions can derive from parent ClNO, which fragments completely in the mass spectrometer, as well as from Cl and NO photofragments. The TOF distributions are considerably slower than for the corresponding gas phase photodissociation process. NO was also detected state selectively by using resonance enhanced multiphoton ionization (REMPI), and a channel corresponding to direct adsorbate photolysis was identified. The state selective detection of NO molecules that emerge from the surface following photolysis shows unambiguously that their rotational degrees of freedom reflect the surface temperature (Trot = 100−140 K), even at low coverages. At similar photolysis wavelengths, gas phase ClNO photodissociation is known to produce highly rotationally excited NO with a distinctive non-statistical distribution peaked at J″ = 46.5. Our studies suggest that, contrary to the gas-phase photolysis results, Cl and NO are not ejected rapidly following photolysis of surface-bound species on a repulsive potential energy surface. We postulate that ClNO grows in islands, with MgO defect sites serving as nucleation centers. Photofragment rotational and translational excitations are quenched efficiently due to strong attractive interactions that equilibrate NO to the surface temperature. Desorption of intact ClNO may also take place, but following (i.e., not during) the photolysis pulse. Such desorbed species can contribute to the TOF spectra, but not the REMPI spectra.

State-selective detection of the PbF molecule by doubly resonant multiphoton ionization

2008 ◽  
Vol 77 (6) ◽  
Author(s):  
P. Sivakumar ◽  
C. P. McRaven ◽  
Dustin Combs ◽  
N. E. Shafer-Ray ◽  
Victor Ezhov
Keyword(s):  
Multiphoton Ionization ◽  
Selective Detection
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