Time Resolved Laser Spectroscopy of Rydberg States in Group IIIA and IIIA Elements
(1984) In Lund Reports in Atomic Physics LRAP-38.- Abstract
- In this work radiative properties of neutral elements with one or
two electrons outside closed subshells have been investigated.
Using laser techniques in connection with atomic beams selective
excitation of Rydberg states was performed. Most of the studied
states were populated with two-step excitation. Some states were
reached directly from the ground state or from a metastable state
and occasionally two-photon absorption was used. The excitation
sometimes involved the use of frequency-doubling and Raman-
shifting techniques.
By time-resolved detection of the decay light from an excited
state, primarily information on the radiative lifetime is... (More) - In this work radiative properties of neutral elements with one or
two electrons outside closed subshells have been investigated.
Using laser techniques in connection with atomic beams selective
excitation of Rydberg states was performed. Most of the studied
states were populated with two-step excitation. Some states were
reached directly from the ground state or from a metastable state
and occasionally two-photon absorption was used. The excitation
sometimes involved the use of frequency-doubling and Raman-
shifting techniques.
By time-resolved detection of the decay light from an excited
state, primarily information on the radiative lifetime is obtained.
With two different experimental arrangements radiative
lifetimes in several Rydberg states have been determined. Using
the quantum-beat technique time-resolved detection also provides
information on energy splittings. This technique was used
to measure hyperfine-structure splittings.To obtain information
about hyperfine-structure constants and isotope shifts high-
resolution spectroscopy on a collimated atomic beam was also
employed.
The behaviour of highly excited alkali atoms is mostly hydrogen-
like and well predicted by theory. Group III A elements have one
electron outside a closed subshell and are expected to behave
like alkali atoms. The situation is however complicated by the
presence of doubly excited states. Configuration interaction can
then cause a partial mixing between singly and doubly excited
states. In the alkaline-earth atoms (group II A elements), having
two electrons outside closed shells, the situation is similar. In
a Rydberg series of one excited electron the admixture of doubly
excited states can cause large deviations from hydrogenic behaviour.
Another complication in the alkaline-earth atoms is the
mixture of singlet- and triplet states.
- 4 -
The presented results from measurements made on Na, Mg, Ca, Sr,
Ba, Al, Ga and In will primarily serve as a basis for tests of
modern atomic-physics models. Some of the lifetime values are
also of astrophysical interest.
Keywords: Laser spectroscopy, Rydberg states, time resolved, high
resolution, two-step excitation, metastable state, two-photon
absorption, frequency doubling, Raman shifting, radiative lifetime,
quantum beat, hyperfine structure, isotope shift, Stark
shift, alkali atoms, group III A elements, alkaline-earth atoms,
configuration interaction, singlet-triplet mixing. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2260427
- author
- Jönsson, Göran LU
- supervisor
- opponent
-
- unknown], [unknown
- organization
- publishing date
- 1984
- type
- Thesis
- publication status
- published
- subject
- in
- Lund Reports in Atomic Physics
- volume
- LRAP-38
- pages
- 119 pages
- publisher
- Division of Atomic Physics, Department of Physics, Faculty of Engineering, LTH, Lund University
- defense location
- n/a
- defense date
- 1984-01-01 01:01:00
- ISSN
- 0281-2762
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Atomic physics (011013005), Physics, Faculty of Technology (011013200)
- id
- 1fad2fdf-6bc0-4436-bcd6-2b7478ab122a (old id 2260427)
- date added to LUP
- 2016-04-04 10:56:53
- date last changed
- 2019-05-21 17:57:51
@phdthesis{1fad2fdf-6bc0-4436-bcd6-2b7478ab122a,
abstract = {{In this work radiative properties of neutral elements with one or<br/><br>
two electrons outside closed subshells have been investigated.<br/><br>
Using laser techniques in connection with atomic beams selective<br/><br>
excitation of Rydberg states was performed. Most of the studied<br/><br>
states were populated with two-step excitation. Some states were<br/><br>
reached directly from the ground state or from a metastable state<br/><br>
and occasionally two-photon absorption was used. The excitation<br/><br>
sometimes involved the use of frequency-doubling and Raman-<br/><br>
shifting techniques.<br/><br>
By time-resolved detection of the decay light from an excited<br/><br>
state, primarily information on the radiative lifetime is obtained.<br/><br>
With two different experimental arrangements radiative<br/><br>
lifetimes in several Rydberg states have been determined. Using<br/><br>
the quantum-beat technique time-resolved detection also provides<br/><br>
information on energy splittings. This technique was used<br/><br>
to measure hyperfine-structure splittings.To obtain information<br/><br>
about hyperfine-structure constants and isotope shifts high-<br/><br>
resolution spectroscopy on a collimated atomic beam was also<br/><br>
employed.<br/><br>
The behaviour of highly excited alkali atoms is mostly hydrogen-<br/><br>
like and well predicted by theory. Group III A elements have one<br/><br>
electron outside a closed subshell and are expected to behave<br/><br>
like alkali atoms. The situation is however complicated by the<br/><br>
presence of doubly excited states. Configuration interaction can<br/><br>
then cause a partial mixing between singly and doubly excited<br/><br>
states. In the alkaline-earth atoms (group II A elements), having<br/><br>
two electrons outside closed shells, the situation is similar. In<br/><br>
a Rydberg series of one excited electron the admixture of doubly<br/><br>
excited states can cause large deviations from hydrogenic behaviour.<br/><br>
Another complication in the alkaline-earth atoms is the<br/><br>
mixture of singlet- and triplet states.<br/><br>
- 4 -<br/><br>
The presented results from measurements made on Na, Mg, Ca, Sr,<br/><br>
Ba, Al, Ga and In will primarily serve as a basis for tests of<br/><br>
modern atomic-physics models. Some of the lifetime values are<br/><br>
also of astrophysical interest.<br/><br>
Keywords: Laser spectroscopy, Rydberg states, time resolved, high<br/><br>
resolution, two-step excitation, metastable state, two-photon<br/><br>
absorption, frequency doubling, Raman shifting, radiative lifetime,<br/><br>
quantum beat, hyperfine structure, isotope shift, Stark<br/><br>
shift, alkali atoms, group III A elements, alkaline-earth atoms,<br/><br>
configuration interaction, singlet-triplet mixing.}},
author = {{Jönsson, Göran}},
issn = {{0281-2762}},
language = {{eng}},
publisher = {{Division of Atomic Physics, Department of Physics, Faculty of Engineering, LTH, Lund University}},
school = {{Lund University}},
series = {{Lund Reports in Atomic Physics}},
title = {{Time Resolved Laser Spectroscopy of Rydberg States in Group IIIA and IIIA Elements}},
url = {{https://lup.lub.lu.se/search/files/5658688/2302142.pdf}},
volume = {{LRAP-38}},
year = {{1984}},
}