Download Imaging in Chemical Dynamics by Arthur G. Suits and Robert E. Continetti (Eds.) PDF

HCl + C₂H₅ response / Peter C. Samartzis, Derek J. Smith, and Theofanis N. Kitsopoulos --
Imaging the atomic orientation and alignment in photodissociation / Eloy R. Wouters ... [et al.] --
Femtosecond time-resolved photoelectron imaging / Toshinori Suzuki, Li Wang, and Hiroshi Kohguchi --
Photoisomerization and photodissociation dynamics of the NCN, CNN, and HNCN unfastened radicals / Ryan T. Bise ... [et al.] --
Three-body dissociation dynamics of temporary impartial species : dissociative photodetachment of O₆⁻ / A.K. Luong, T.G. Clements, and R.E. Continetti --
Fragmentation of Na[subscript n] clusters by means of He effect : non-adiabatic elements / D. Babikov ... [et al.] --
3D coincident imaging spectroscopy for ions and electrons / R. Dörner ... [et al.] --
State-to-state dissociation of molecular ions / D. Zajfman.

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F r o m such images, we can count the number of pixels (1-2) for the width of a resolvable ring and estimate that the velocity resolution is better than 1% for our apparatus when the ring is near the edge of our image (about 256 pixels wide). O f course, for smaller rings, the resolution is correspondingly worse, but we can always adjust the acceleration voltages to produce an expanded image at the detector. ; ACS Symposium Series; American Chemical Society: Washington, DC, 2000. ch003 38 Figure 2 First image of methyl radicals from the photodissociation of methyl iodide.

A n on-axis molecular beam geometry is used so that the projection of the velocity spread of the parent molecule beam onto the plane of the imaging detector is minimized. The beam of oxygen molecules is skimmed and then passes through a small hole in a repeller plate disc to enter the ionization region. A laser beam crosses the molecular beam, causing dissociation and ionization of the Ο atom photofragments. These 0 ions are accelerated along the time-of-flight axis towards the two-dimensional multi-channel plate (MCP) / phosphor screen detector, which is monitored by a C C D camera.

The symmetry of the transition and time delays during the fragmentation do, of course, leave their imprint on β but the quantity which has been measured is an average over the time of dissociation. The use of a fs laser allows, in favorable cases, a mesasurement of the process in real time. The caveat is that direct dissociations producing fast light particles are still too fast to measure. However, many interesting processes involve delays due to curve crossing or to separation of slow heavy fragments.

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