# Accession Number:

## AD0429408

# Title:

## BREMSSTRAHLUNG CROSS SECTIONS IN THE NEIGHBORHOOD OF THE PLASMA FREQUENCY,

# Descriptive Note:

# Corporate Author:

## YALE UNIV NEW HAVEN CONN OBSERVATORY

# Personal Author(s):

# Report Date:

## 1963-11-01

# Pagination or Media Count:

## 26.0

# Abstract:

The spontaneous emission probability due to the bremsstrahlung mechanism for photons whose frequencies are close to the plasma frequency is computed on the basis of classical radiation theory. The particle orbits are calculated using for the interaction potential electron-ion a Cou lomb form which is cut off at the Debye distance. The resulting emission probability undergoes a rapid, smooth transition at frequencies close to the plasma frequency from the logarithmic frequency dependence, typical of the high frequency limit, to the frequency-idependent expression, derived in the d.c. limit. For practical purposes, shielding corrections can be neglected in computing the Fourier components of the acceleration, but must be applied for frequencies in the neighborhood of the plasma frequency, when the spectrum is averaged over collision parameters. Author