Advanced Light Source [activity rpt 1997-1998]

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Additional info for Advanced Light Source [activity rpt 1997-1998]

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CHEMICAL DYNAMICS be distinguished by PTS with traditional detecti Discrimination of Isomeric Photofragments: Photodissociation of Allene and Propyne methods, such as electron impact. Hydrocarbon for example, often contain multiple inequivalenl C-H bonds. Depending on which bond or bon{ r“upthre,isomeric photofragments can be produf Traditional methodsfor determining tbephotodissocia- In the current study, PTS has been coupled with tion products of a molecu[e are not aiways adequate, electron impact and photoionization detection purticular~fir rno[eculesthat canform isomericprod- schemes to investigate the photodissociation dyl ucts.

Jaecks, “High resolution polarization analysis of the fluorescence from Ar+ [3P]4p2P3,2formed in photoionization,” Phys. Rev. Lett. 79, 5222(1997). 75 Ionizing Photon Energy (eV) Figure 1 Total fluorescent intensity from theAr+ 3p4[3P]4p2D3n along with the total alignment ization of this fluorescence. u, but ratherintenactwith one cloud’s spatial distribution, which can be used to quantify the anothez One si~ature ofmch electronintera~”on, or relativistic interactions between the autoionizing ns Rydberg for corre/atz”on, k the observationof two excz”tedekz-trons electron, the 3p4 subshell, and the 4p valence electrons.

We found larger effects in the other com- netic field generated in the downward resonant tran- pounds, with peak values up to ] ojcxo and energy- sition on the neighbor is transferred to the atom integrated vahtesup to 290/o for severalresonances in responsible for photoemission. ,Mn0,. Wedso found enhancement ofmanganese photoemission due to lanthanum 3d reso- neighbor element (via a core-level excitation ener- nances, a second nearest-neighbor interaction. Finally gy), the identity of the neighbor atom is established.

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