Donald C. O’Shea

Resonance Raman spectra of manganese (III) etioporphyrin I

Resonance Raman spectra of manganese (III) etioporphyrin I complexes have been obtained with laser excitation in the regions of the bands III and IV, and bands V and Va of the atypical visible absorption spectra of these metalloporphyrins. Excitation profiles in the latter region are interpreted as indicating nonadiabatic coupling between V and Va as well as vibronic activity of some totally symmetric modes. The Raman data support assignment of bands III and IV to the 0–0 and 0–1 components of the Q band. Although bands V and Va are assigned to a charge transfer transition mixed with the main π→π* transition, no selective enhancement of low frequency metal–ligand vibrations attributable to the charge transfer contribution of band V was observed.

Resonance Raman spectra of copper tetraphenylporphyrin: Effects of strong vibronic coupling on excitation profiles and the absorption spectrum

Raman excitation profiles of copper tetraphenylporphyrin have been obtained and interpreted in terms of strong vibronic coupling. The Duschinsky mixing of normal modes in the excited Q electronic state has a dominant effect on the excitation profiles and the absorption spectrum. A general theoretical technique for calculating the vibronic states of molecules is described and applied to metalloporphyrins. The analytical expressions obtained from a new perturbation treatment of the vibronic problem permit a detailed physical understanding of strong coupling influences and interference effects observed in copper tetraphenylporphyrin excitation spectra. A modified interpretation of the Q band absorption is indicated.

NO(2) Concentration Measurements in an Urban Atmosphere Using Differential Absorption Techniques.

NO(2) absorption coefficients for the most prominent argon-ion laser lines have been measured. A technique for measurement of NO(2) concentration in an urban atmosphere in real time is described. Preliminary results using the differential absorption of argon-ion laser lines by NO(2) in an urban (Atlanta, Georgia) atmosphere are presented. A simplified detection system using the differential absorption is proposed.

2008 in Review

On October 28 the Board of Supervisors approved a much-needed expansion of the County’s Emergency Operations Center in Rialto. The 1,530-square-foot expansion to the 6,000-square-foot facility will enhance the county’s ability to coordinate multi-agency responses to both smalland large-scale disasters. In September, the Federal Emergency Management Agency awarded the County a

May I have your attention, please!

323,943 grant for EOC expansion. It was the only jurisdiction in California to receive such a grant. The total cost of the project is

Ultrashort-laser-pulse measurement using swept beams

512,000 with the balance to come from the County’s Capital Improvement Program and other County funds.

1999 in Review

This thesis examines the discourse used during morning announcements by elementary principals at three separate schools in the Toronto Catholic District School Board (TCDSB). Using the theoretical frameworks of institutional ethnography and discourse analysis, this data is analyzed to examine whether principals use morning announcements primarily as an information sharing exercise or they use announcements to serve other purposes as well. My analysis of the data concludes that principals not only use morning announcements to share information and manage the day-to-day business of running a school. Principals also use morning announcements create for themselves (either consciously or unconsciously) what I call a “principal” identity. Thematic and structural analysis is used to analyze the data in order to better understand a common structure of delivery evident in all three schools. This serves to underscore the concept of ruling relations; a notion used by institutional ethnographers to demonstrate how everyday experiences within institutions are mediated by an internally coordinated complex of administrative, managerial and discursive organization that often remain hidden. Thematic analysis is also used to highlight key themes within the content of the announcements. Three key themes of Safety/Rules, Personal Connections and Spiritual Education are examined. This study uses discourse analysis to reflect on how language does the work of several building tasks; those of identity, relationship and politics are the most relevant to this analysis. The findings are helpful in giving a better understanding of the often-overlooked everyday practice of delivering morning announcements in elementary schools. Principals are encouraged to consider how this practice offers them an important opportunity to connect with students and demonstrate positive models of leadership.

National Inventors Hall of Fame

We demonstrate a frequency-resolved optical gating (FROG) device that uses a sweepshot geometry that combines the advantages of multishot and single-shot pulse-measurement devices, has only one moving part, a galvanometer, and requires no computer control. Like a multishot device, it focuses the beam to a small spot (rather than a line focus) and has a high intensity in the nonlinear medium. Like single-shot devices, it makes measurements quickly, generating an entire FROG trace on a single camera screen (rather than requiring many camera downloads).

All the News

In keeping with an Optical Engineering tradition, I want to report on the state of the journal at the end of 1999. The most remarkable aspect of this year’s production was probably noticed by most readers—it’s thinner...a lot thin-ner. The number of pages and papers has dropped by a third. In an era of ever-increasing numbers—at least if you listen to the financial news these days—this result would be announced in the gravest tones. Down is bad. For Op-tical Engineering, I believe that the reduced page and paper counts were the result of a change in approach to editing the journal.

Brillouin scattering from liquid benzene at high pressures

This PDF file contains the editorial “National Inventors Hall of Fame” for OE Vol. 45 Issue 12