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Atomic Spectroscopy: Absorption, Emission, and Fluorescence

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Related Experiment Video

Updated: Jun 14, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F⁻

Published on: July 27, 2018

First optical hyperfine structure measurement in an atomic anion.

A Fischer¹, C Canali, U Warring

¹Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117 Heidelberg, Germany.

Physical Review Letters

|April 7, 2010

Summary

Researchers studied the unique electric-dipole transition in negative osmium ions using laser spectroscopy. They determined the excited state

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Last Updated: Jun 14, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

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Published on: July 27, 2018

In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence

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Published on: June 13, 2020

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

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Published on: June 28, 2016

Area of Science:

Atomic Physics
Spectroscopy
Quantum Chemistry

Background:

Atomic anions possess unique electronic structures.
Electric-dipole transitions in anions are rare and scientifically significant.
Osmium anions offer a unique system for studying atomic structure and transitions.

Purpose of the Study:

Investigate the hyperfine structure of a specific transition in the negative osmium ion (Os-).
Determine the total angular momentum of the excited state.
Explore the potential for laser cooling of Os-.

Main Methods:

High-resolution collinear laser spectroscopy was employed.
Experimental determination of hyperfine structure constants.
Comparison with multiconfiguration Dirac-Fock calculations.

Main Results:

The total angular momentum of the excited state was determined to be J=9/2.
Hyperfine structure constants for ground and excited states were experimentally determined.
Calculations were performed for the energy level diagram of 192Os- in a magnetic field.

Conclusions:

The study identified a unique electric-dipole transition in Os-, potentially suitable for laser cooling.
Experimental and theoretical data were obtained for Os- hyperfine structure.
The findings contribute to understanding atomic anions and developing laser cooling techniques.