Ephpheta Bulletin, May 1975

A newsletter published for Deaf Catholics in Los Angeles, C

July 4th 2001

Alfredo Enciso, longtime San Bernardino business to retire? Page 2 Succeeding in america Page 2 Hispanic entities to honor Judge Donald Alvarez Page 2 Paige announces $19.4 million in grants to colleges serving hispanic americans Page 3 Riverside county receives over$5.3 million for juvenile crime prevention Page 3 Maldef urges California Senate education committee to follow Texas example and allow all California high school graduates to pay in-state tuition for college Page 3 New latin american studies coordinator for CSUSB Page 6 Music series features classic rock, latin, soul, R&B Page 6 Seniors-Don\u27t pay for free service- advises assessor and state! Page 6 Making the right choices with sound information Page 7 Baca announces Hispanic education grant to California State University-San Bernardino Page 8 The furture is on hold, but not for very long Page 9 Francisca Sanchez elected president of Cabe Page 10 Bette Harrison named Assistant superintendent for county schools administrative services division Page 1

Mass spectroscopy of molecules following deep-core-shell photoexcitation

The relaxation dynamics of HCl, DCl, H{dollar}\sb2{dollar}S, and D{dollar}\sb2{dollar}S following photoexcitation in the vicinity of the Cl, and S K-shell thresholds ({dollar}\sim{dollar}2.8 keV for Cl, {dollar}\sim{dollar}2.5 keV for S) were studied by means of ion time-of-flight mass spectroscopy using monochromatic synchrotron radiation. In all cases, the onset of pre-edge core-shell photoionization precedes the formation on resonance of a significant amount of neutral hydrogen as well as post-collision-interaction effects above threshold. At the lowest resonant excitation to the 6{dollar}\sigma\sp{\*}{dollar} antibonding orbital in HCl, almost half of the excited molecules decay by emission of a neutral H atom, mostly in coincidence with a highly charged Cl{dollar}\sp{n+}{dollar} ion. The present work demonstrates that neutral-atom emission can be a significant decay channel for excited states with very-short lifetimes (1 fs). The first detailed observations of molecular fragmentation mediated by post-collision interaction between a photoelectron and an Auger electron are also presented, evidenced by the re-capture of Cl-K photoelectrons by either Cl{dollar}\sp{n+}{dollar} or H{dollar}\sp+{dollar} dissociation fragments. In addition, examination of the width of the H{dollar}\sp+{dollar} peak in HCl and H{dollar}\sb2{dollar}S spectra taken with the analyzer parallel and perpendicular to the polarization vector of the incident light indicate that the asymmetry parameter {dollar}\beta{dollar} is positive on resonance. Finally, the relaxation dynamics of CH{dollar}\sb3{dollar}Cl following core-shell excitation in the neighborhood of the chlorine K edge ({dollar}\approx{dollar}2.8 keV) were studied using multi-ion coincidence techniques. Analysis of the data provides evidence for sequential fragmentation of the molecule. In addition, for higher ionic charge states, the fragmentation mechanism was seen to change with photon energy

Research and technology, 1992

Selected research and technology activities at Ames Research Center, including the Moffett Field site and the Dryden Flight Research Facility, are summarized. These activities exemplify the Center's varied and productive research efforts for 1992

1995 BRAC Commission

Executive Correspondence Tracking System #18 - May 1995 (950512-1 - 950516-8). Box 53, C-009