Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Journal of Physics B Atomic and Molecular Physics

Measurements of the population of excited Na atoms in laser-excited Na vapour

Simon Y. Tang, D P Wang, R. H. Neynaber

Published Jan 14, 1986• 5 citations
Publisher

Abstract

A beam-gas method is described for measuring the fraction f* of laser-excited atoms in Na vapour. Both single-mode and broad-band radiation is used at the frequency of the sodium D 1 or D 2 line. The method is based on measurements of ion pair production from collisions of ground-state Na and Cl. Since ion pairs are not produced with excited Na, the f* can be determined from measurements with the laser on and off.

DOI
10.1088/0022-3700/19/1/005

Related papers

Instrumentation for Particle-Beams Research Using Laser Excited Merging Beams.

R. H. Neynaber, Simon Y. Tang

A summary of research performed under AFOSR Grant No. 83-0242 is given. The review describes molecular-beam studies of ion-pair production and measurements of the fraction of excited Na atoms, f*, in a composite beam of ground-state and excited Na atoms. The actual ion-pair production reactions studied are the following: Na + Br yield Na(+) + B(-), Na + I2 yield Na(+) + I2(-), Na(Na*) + Na yield Na(+) + Na(-), and Li + Na yield Li(-) + Na(+). The reaction Na + I2 yield Na(+) + I2(-) was used to measure f*. A value of about 6% was obtained. The work was performed using instrumentation provided by the grant.

•Aug 24, 1984•0 citations

Laser photodissociation of Na2+ions produced by laser resonant and non-resonant ionisation of Na vapour

F. Roussel, B. Carré, P. Breger +1 more

The authors report direct measurements of the photodissociation of Na 2 + ions created when a Na vapour in the density range 10 12 -10 13 cm -3 is irradiated by a pulsed laser with intensities in the 10 5 -10 6 W cm -2 range. The Na 2 + ions, accelerated by a weak electric field, are photodissociated in a second laser beam tuned to 6040 AA. In a preliminary experiment the Na 2 + ions are formed in the lowest vibrational levels and the measured photodissociation cross section is compared with existing calculations. When the Na vapour is irradiated at one of the 3S 1/2 -3P 1/2,3/2 resonances the photodissociation measurements show the existence of a distribution of rovibrational excited levels of the Na 2 + ions. A discussion is given in terms of associative ionisation in collisions of two Na(3p) atoms. The origin of the Na + ions produced simultaneously with the Na 2 + ions, in the vapour irradiated at resonance, is also discussed.

Journal of Physics B Atomic and Molecular Physics•May 28, 1983•8 citations

Instrumentation for particle-beams research using laser-excited merging beams. Final report, 25 June 1983-24 December 1984

R. H. Neynaber, Suo Tang

A summary of research performed under AFOSR Grant No. 83-0242 is given. The review describes molecular-beam studies of ion-pair production and measurements of the fraction of excited Na atoms, F*, in a composite beam of ground-state and excited Na atoms. Molecular beam techniques will be employed to study two-body reactions that will result in an intense, collimated beam of Li atoms at an energy of several hundred keV. Generating such a beam by charge transfer of a Li/sup +/ beam is not efficient at this energy. It appears that it can most efficiently be produced by forming a Li/sup -/ beam and stripping away valence electrons in a suitable gas. Plans are to study reactions associated with the production of Li/sup -/ beam which is formed when a Li/sup +/ beam interacts with a vapor of ground and excited (resonance state) Na atoms. One of the reactions (after Li/sup +/ has been converted to Li) is Li + Na yield Li/sup -/ + Na(+). This will be examined by merging a Li beam with a beam of Na atoms excited with a single frequency dye laser. The instrumentation required to complete this study consists of some laser and optical components,more » some vacuum equipment, and a laboratory computer system for data acquisition and analysis. This apparatus will supplement as well as rejuvenate an existing merging-beam apparatus.« less

•Feb 21, 1985•0 citations

Time-Resolved Spectroscopy With A Narrow-Band Pulsed Dye Laser At High Irradiances

A. R. van Bergen, Tj. Hollander, Cornelis Th. J. Alkemade

We measured the fluorescence spectrum of the Na-D lines in a sodium vapour cell filled with Ar gas, excited by an intense, nearly monochromatic laser near resonance. In this case the theory (dressed-atom model) predicts a line splitting dependent on the laser intensity.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Mar 27, 1985•0 citations

Cross sections for the excitation energy transfer induced by collisions with He, Ar and Na atoms

Vlasta Horvatić, Mladen Movre, Cedomil Vadla

The cross sections for the excitation energy transfer induced by collisions with He, Ar and Na ground-state atoms have been measured. The sodium atoms in the 4D state have been produced by two-photon excitation using cw laser radiation at 578.89 nm. Within a model which takes into account collisional population and depopulation of the 4F level as well as radiative relaxation (direct or cascade) of the 3D, 4P, 4D and 4F states ending in the 3P level, the rate for the collisional transfer turns out to be related to the ratio of the steady-state populations created in 3D and 4D states. They have been determined by measuring the fluorescence intensities of the and transitions. The measurements yield the following cross section values for those processes investigated: , and , at .

Journal of Physics B Atomic Molecular and Optical Physics•Nov 14, 1997•1 citation

Cross sections for the Na(4D)→Na(4F) excitation energy transfer induced by collisions with He, Ar and Na atoms

Vlasta Horvatić, Mladen Movre, Cedomil Vadla

Abstract. The cross sections for the Na.4D/! Na.4F / excitation energy transfer induced by collisions with He, Ar and Na ground-state atoms have been measured. The sodium atoms in the 4D state have been produced by two-photon excitation using cw laser radiation at 578.89 nm. Within a model which takes into account collisional population and depopulation of the 4F level as well as radiative relaxation (direct or cascade) of the 3D, 4P, 4D and 4F states ending in the 3P level, the rate for the Na.4D / ! Na.4F / collisional transfer turns out to be related to the ratio of the steady-state populations created in 3D and 4D states. They have been determined by measuring the fluorescence intensities of the 3D! 3P and 4D! 3P transitions. The measurements yield the following cross section values for those

•Jan 1, 1997•0 citations
A beam-gas method is described for measuring the fraction f* of laser-excited atoms in Na vapour. Both single-mode and broad-band radiation is used at the frequency of the sodium D 1 or D 2 line. The method is based on measurements of ion pair production from collisions of ground-state Na and Cl. Since ion pairs are not produced with excited Na, the f* can be determined from measurements with the laser on and off.
A summary of research performed under AFOSR Grant No. 83-0242 is given. The review describes molecular-beam studies of ion-pair production and measurements of the fraction of excited Na atoms, f*, in a composite beam of ground-state and excited Na atoms. The actual ion-pair production reactions studied are the following: Na + Br yield Na(+) + B(-), Na + I2 yield Na(+) + I2(-), Na(Na*) + Na yield Na(+) + Na(-), and Li + Na yield Li(-) + Na(+). The reaction Na + I2 yield Na(+) + I2(-) was used to measure f*. A value of about 6% was obtained. The work was performed using instrumentation provided by the grant.
The authors report direct measurements of the photodissociation of Na 2 + ions created when a Na vapour in the density range 10 12 -10 13 cm -3 is irradiated by a pulsed laser with intensities in the 10 5 -10 6 W cm -2 range. The Na 2 + ions, accelerated by a weak electric field, are photodissociated in a second laser beam tuned to 6040 AA. In a preliminary experiment the Na 2 + ions are formed in the lowest vibrational levels and the measured photodissociation cross section is compared with existing calculations. When the Na vapour is irradiated at one of the 3S 1/2 -3P 1/2,3/2 resonances the photodissociation measurements show the existence of a distribution of rovibrational excited levels of the Na 2 + ions. A discussion is given in terms of associative ionisation in collisions of two Na(3p) atoms. The origin of the Na + ions produced simultaneously with the Na 2 + ions, in the vapour irradiated at resonance, is also discussed.
A summary of research performed under AFOSR Grant No. 83-0242 is given. The review describes molecular-beam studies of ion-pair production and measurements of the fraction of excited Na atoms, F*, in a composite beam of ground-state and excited Na atoms. Molecular beam techniques will be employed to study two-body reactions that will result in an intense, collimated beam of Li atoms at an energy of several hundred keV. Generating such a beam by charge transfer of a Li/sup +/ beam is not efficient at this energy. It appears that it can most efficiently be produced by forming a Li/sup -/ beam and stripping away valence electrons in a suitable gas. Plans are to study reactions associated with the production of Li/sup -/ beam which is formed when a Li/sup +/ beam interacts with a vapor of ground and excited (resonance state) Na atoms. One of the reactions (after Li/sup +/ has been converted to Li) is Li + Na yield Li/sup -/ + Na(+). This will be examined by merging a Li beam with a beam of Na atoms excited with a single frequency dye laser. The instrumentation required to complete this study consists of some laser and optical components,more » some vacuum equipment, and a laboratory computer system for data acquisition and analysis. This apparatus will supplement as well as rejuvenate an existing merging-beam apparatus.« less
The cross sections for the excitation energy transfer induced by collisions with He, Ar and Na ground-state atoms have been measured. The sodium atoms in the 4D state have been produced by two-photon excitation using cw laser radiation at 578.89 nm. Within a model which takes into account collisional population and depopulation of the 4F level as well as radiative relaxation (direct or cascade) of the 3D, 4P, 4D and 4F states ending in the 3P level, the rate for the collisional transfer turns out to be related to the ratio of the steady-state populations created in 3D and 4D states. They have been determined by measuring the fluorescence intensities of the and transitions. The measurements yield the following cross section values for those processes investigated: , and , at .
Abstract. The cross sections for the Na.4D/! Na.4F / excitation energy transfer induced by collisions with He, Ar and Na ground-state atoms have been measured. The sodium atoms in the 4D state have been produced by two-photon excitation using cw laser radiation at 578.89 nm. Within a model which takes into account collisional population and depopulation of the 4F level as well as radiative relaxation (direct or cascade) of the 3D, 4P, 4D and 4F states ending in the 3P level, the rate for the Na.4D / ! Na.4F / collisional transfer turns out to be related to the ratio of the steady-state populations created in 3D and 4D states. They have been determined by measuring the fluorescence intensities of the 3D! 3P and 4D! 3P transitions. The measurements yield the following cross section values for those