Vibronic structure of the second triplet state of 1,3,5-hexatriene

Electron impact spectroscopy is used to study the vibronic structive of the second triplet state of 1,3,5-hexatriene

Doublet-->quartet transitions in nitric oxide as detected by electron-impact spectroscopy

Vibronic bands in NO are investigated using electron beam excitation. The beams had energies of 25, 35, and 50 eV

Central-field intermolecular potentials from the differential elastic scattering of H2(D2) by other molecules

Differential elastic scattering cross sections for the systems H2+ O2, SF6, NH3, CO, and CH4 and for D2+ O2, SF6, and NH3 have been obtained from crossed beam studies. In all cases, rapid quantum oscillations have been resolved which permit the determination of intermolecular potential parameters if a central-field assumption is adopted. These potentials were found to be independent of both the isotopic form of the hydrogen molecule, and the relative collision energy. As a result of this, and the ability of these spherical potentials quantitatively to describe the measured scattering, it is concluded that anisotropy effects do not seem to be important in these H2(D2) systems

Purpose, Meaning, and Exploring Vocation in Honors Education

This paper examines the importance of cultivating a sense of vocation in honors education. Through examples of coursework, program initiatives, and advising strategies, authors from across five institutions align the scholarship of vocation with best practices and principles in contemporary honors discourse, defining vocation in the context of higher education and describing how this concept works within honors curricula to enrich student experience and cultivate individual understandings of purpose. By focusing on critical reflection processes, Ignatian pedagogy, and theories of moral development and reasoning, the authors offer different models to advance the thesis that honors educators can and should address personal fulfillment in addition to intellectual talent, and they posit vocational exploration and discernment as tools for extending and deepening their students’ personal sense of meaning in local and global communities

Open ocean carbon monoxide photo-production

Sunlight-initiated photolysis of chromophoric dissolved organic matter (CDOM) is the dominant source of carbon monoxide (CO) in the open-ocean. A modelling study was conducted to constrain this source. Spectral solar irradiance was obtained from two models (GCSOLAR and SMARTS2). Water-column CDOM and total light absorption were modelled using spectra collected along a Meridional transect of the Atlantic ocean using a 200-cm pathlength liquid waveguide UV-visible spectrophotometer. Apparent quantum yields for the production of CO (AQYCO) from CDOM were obtained from a parameterisation describing the relationship between CDOM light absorption coefficient and AQYCO and the CDOM spectra collected. The sensitivity of predicted rates to variations in model parameters (solar irradiance, cloud cover, surface-water reflectance, CDOM and whole water light absorbance, and AQYCO was assessed. The model\u27s best estimate of open-ocean CO photoproduction was 47 +/- 7 Tg CO-C yr-1, with lower and upper limits of 38 and 84 Tg CO-C yr-1, as indicated by sensitivity analysis considering variations in AQYs, CDOM absorbance, and spectral irradiance. These results represent significant constraint of open-ocean CO photoproduction at the lower limit of previous estimates. Based on these results, and their extrapolation to total photochemical organic carbon mineralisation, we recommend a downsizing of the role of photochemistry in the open-ocean carbon cycle. (c) 2006 Elsevier Ltd. All rights reserved

Singlet→triplet transitions in C≡N containing molecules by electron impact

The electron-impact excitation spectra of hydrogen cyanide (HCN), acetonitrile (CH3CN), malononitrile [CH2(CN)2], propionitrile (C2H5CN), and butyronitrile (C3H7CN) have been studied experimentally at impact energies of 25, 50, and 75 eV and at scattering angles from 5° to 80°. Results for hydrogen cyanide are in excellent agreement with previous work. Previously unobserved singlet-->triplet transitions of acetonitrile, propionitrile, and butyronitrile are reported. Also, the first study of the electronic spectrum of malononitrile is reported. Tentative assignments for transitions observed are reported

Présence de la philosophie

Fil: Aron, Robert. Université de Pari

Recherche d’une dialectique pour les Etats-Unis d’Europe

Fil: Aron, Robert. Université de Pari