Extension of a basic experiment

The polarisation of the white-light-excited spectrally resolved Na D lines and its relation to electron impact excitation

B. Stumpf, K. Becker, G. Schulz

Research output: Contribution to journalArticle

Abstract

The polarisation of spectrally resolved Na D lines excited by white, linearly polarised light in a homogeneous magnetic field up to 1000 G was measured by means of the crossed-beam technique. The axis of observation, the sodium beam and the direction of the magnetic field were mutually at right angles. The incoming light beam was directed along the magnetic field and linearly polarised either parallel to the axis of observation or perpendicular to it. A Lyot filter of high transmission and a sensitive photon-counting technique made it possible to detect the small intensities of the resolved Na D doublet excited by the light of a xenon arc lamp. The measured polarisations are found to be in excellent agreement with those calculated by means of Breit's theory and the ambiguities of earlier investigations are completely removed. The importance of our results for electron impact excitation in magnetic fields parallel to the beam is discussed. It is shown that the polarisation of the electron impact excited Na D lines is no longer perturbed by hyperfine structure if a magnetic field of 500 G parallel to the beam is applied.

Original languageEnglish (US)
Article number001
JournalJournal of Physics B: Atomic and Molecular Physics
Volume13
Issue number21
DOIs
StatePublished - 1980

Fingerprint

D lines
electron impact
polarization
magnetic fields
excitation
arc lamps
xenon lamps
hyperfine structure
light beams
ambiguity
polarized light
counting
sodium
filters
photons

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

@article{b7378a727c594e38a069c9e86228feb1,
title = "Extension of a basic experiment: The polarisation of the white-light-excited spectrally resolved Na D lines and its relation to electron impact excitation",
abstract = "The polarisation of spectrally resolved Na D lines excited by white, linearly polarised light in a homogeneous magnetic field up to 1000 G was measured by means of the crossed-beam technique. The axis of observation, the sodium beam and the direction of the magnetic field were mutually at right angles. The incoming light beam was directed along the magnetic field and linearly polarised either parallel to the axis of observation or perpendicular to it. A Lyot filter of high transmission and a sensitive photon-counting technique made it possible to detect the small intensities of the resolved Na D doublet excited by the light of a xenon arc lamp. The measured polarisations are found to be in excellent agreement with those calculated by means of Breit's theory and the ambiguities of earlier investigations are completely removed. The importance of our results for electron impact excitation in magnetic fields parallel to the beam is discussed. It is shown that the polarisation of the electron impact excited Na D lines is no longer perturbed by hyperfine structure if a magnetic field of 500 G parallel to the beam is applied.",
author = "B. Stumpf and K. Becker and G. Schulz",
year = "1980",
doi = "10.1088/0022-3700/13/21/001",
language = "English (US)",
volume = "13",
journal = "Journal of the Physics B: Atomic and Molecular Physics",
issn = "0022-3700",
publisher = "Institute of Physics",
number = "21",

}

TY - JOUR

T1 - Extension of a basic experiment

T2 - The polarisation of the white-light-excited spectrally resolved Na D lines and its relation to electron impact excitation

AU - Stumpf, B.

AU - Becker, K.

AU - Schulz, G.

PY - 1980

Y1 - 1980

N2 - The polarisation of spectrally resolved Na D lines excited by white, linearly polarised light in a homogeneous magnetic field up to 1000 G was measured by means of the crossed-beam technique. The axis of observation, the sodium beam and the direction of the magnetic field were mutually at right angles. The incoming light beam was directed along the magnetic field and linearly polarised either parallel to the axis of observation or perpendicular to it. A Lyot filter of high transmission and a sensitive photon-counting technique made it possible to detect the small intensities of the resolved Na D doublet excited by the light of a xenon arc lamp. The measured polarisations are found to be in excellent agreement with those calculated by means of Breit's theory and the ambiguities of earlier investigations are completely removed. The importance of our results for electron impact excitation in magnetic fields parallel to the beam is discussed. It is shown that the polarisation of the electron impact excited Na D lines is no longer perturbed by hyperfine structure if a magnetic field of 500 G parallel to the beam is applied.

AB - The polarisation of spectrally resolved Na D lines excited by white, linearly polarised light in a homogeneous magnetic field up to 1000 G was measured by means of the crossed-beam technique. The axis of observation, the sodium beam and the direction of the magnetic field were mutually at right angles. The incoming light beam was directed along the magnetic field and linearly polarised either parallel to the axis of observation or perpendicular to it. A Lyot filter of high transmission and a sensitive photon-counting technique made it possible to detect the small intensities of the resolved Na D doublet excited by the light of a xenon arc lamp. The measured polarisations are found to be in excellent agreement with those calculated by means of Breit's theory and the ambiguities of earlier investigations are completely removed. The importance of our results for electron impact excitation in magnetic fields parallel to the beam is discussed. It is shown that the polarisation of the electron impact excited Na D lines is no longer perturbed by hyperfine structure if a magnetic field of 500 G parallel to the beam is applied.

UR - http://www.scopus.com/inward/record.url?scp=36149049354&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=36149049354&partnerID=8YFLogxK

U2 - 10.1088/0022-3700/13/21/001

DO - 10.1088/0022-3700/13/21/001

M3 - Article

VL - 13

JO - Journal of the Physics B: Atomic and Molecular Physics

JF - Journal of the Physics B: Atomic and Molecular Physics

SN - 0022-3700

IS - 21

M1 - 001

ER -