Photoionization Cross-Sections of Carbon-Like N+ Near the K-Edge (390–440 eV)

The Calculation of Photoionization Cross Sections

Absolute photoionization cross sections of atomic oxygen.

The abso lu t e va lues of t h e pho to ion iza t ion c r o s s s e c t i o n s of a tomic oxygen have been measured from t h e i o n i z a t i o n th reshold t o 120 1. An au to ion iz ing resonance belonging t o t h e 2 ~ 2 ~ ~ ( 4 ~ )3p( DO, 3s0, 3p0) t r a n s i t i o n h a s been observed a t 479.43 1 and another l i n e a t 389.97 1. The experimental d a t a is i n e x c e l l e n t agree...

Vibrationally resolved partial cross sections and asymmetry parameters for carbon K-shell photoionization of the CO2 molecule

We have measured the vibrationally resolved partial cross sections σv′ 1 and asymmetry parameters βv′ 1 for C K-shell photoionization of the CO2 molecule in the u shape resonance region above the C K-shell ionization threshold. The positions of both the maxima of σv′ 1 and the minima of βv′ 1 move towards the C K-shell threshold with increasing symmetric stretching vibrational excitation v′ 1 i...

Inferring Neutrino Cross Sections Above 10 eV

Extremely high energy neutrinos propagating in the atmosphere or in the Earth can originate horizontal or upgoing air-showers, respectively. We calculate the acceptances (event rate/flux) for detecting both types of events by fluorescence detectors, both spacebased as with the EUSO and OWL proposals, and ground-based, as with Auger, HiRes and Telescope Array. We depict them as a function of the...

Relativistic photoionization cross sections for C II

High resolution measurements of photoionization cross sections for atomic ions are now being made on synchrotron radiation sources. The recent measurements by Kjeldsen etal. (1999) showed good agreement between the observed resonance features and the the theoretical calculations in the close coupling approximation (Nahar 1995). However, there were several observed resonances that were missing i...