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390 papers · 1 filter
Amorphous-like Density of Gap States in Single Crystal Pentacene
D. V. Lang, X. Chi, T. Siegrist +2
We show that optical and electrical measurements on pentacene single crystals can be used to extract the density of states in the HOMO-LUMO bandgap. It is found that these highly p…
Bias-Dependent Generation and Quenching of Defects in Pentacene
D. V. Lang, X. Chi, A. M. Sergent +1
We describe a defect in pentacene single crystals that is created by bias stress and persists at room temperature for an hour in the dark but only seconds with 420nm illumination.…
Dredge-up and envelope burning in intermediate mass giants of very low metallicity
Falk Herwig
(abbreviated) The evolution of intermediate mass stars at very low metallicity during their final thermal pulse asymptotic giant branch phase is studied in detail. As representativ…
Nonlinear dynamics, rectification, and phase locking for particles on symmetrical two-dimensional periodic substrates with dc and circular ac drives
C. Reichhardt, C. J. Olson Reichhardt, M. B. Hastings
We investigate the dynamical motion of particles on a two-dimensional symmetric periodic substrate in the presence of both a dc drive along a symmetry direction of the periodic sub…
Blazar Flaring Rates Measured with GLAST
C. D. Dermer, B. L. Dingus
We derive the minimum observing time scales to detect a blazar at a given flux level with the LAT on GLAST in the scanning and pointing modes. Based upon Phase 1 observations with…
A Survey of Open Clusters in the u'g'r'i'z' Filter System: I. Results for NGC2548 (M48)
Cristin J. Rider, Douglas L. Tucker, J. Allyn Smith +3
We present initial results of a photometric survey of open star clusters, primarily in the southern hemisphere, taken in the u'g'r'i'z' filter system. While our entire observed sam…