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Ion-atom collision-induced absorption.

D Rogovin, P Avizonis, J Filcoff

|September 1, 2009

Summary

This summary is machine-generated.

Collision-induced absorption in ion-atom interactions creates intense, narrow spectral lines. This study demonstrates this phenomenon using tin atoms and iodide ions, showing significant absorption coefficients.

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Area of Science:

Atomic and Molecular Physics
Quantum Electrodynamics
Spectroscopy

Background:

Collision-induced absorption (CIA) is a phenomenon where atomic or molecular collisions lead to light absorption.
Long-range electrostatic forces play a crucial role in mediating these collision-induced transitions.
Understanding CIA is vital for interpreting spectra in various physical environments, including astrophysical and laboratory plasmas.

Purpose of the Study:

To investigate the linear electrodynamics governing ion-atom collision-induced absorption.
To analyze the characteristics of spectral lines produced by this process, focusing on intensity, symmetry, and width.
To apply these principles to a specific forbidden transition in tin (Sn) induced by collisions with iodide ions (I(-)).

Main Methods:

Theoretical examination of linear electrodynamics in the context of ion-atom collisions.
Analysis of spectral line properties resulting from collision-induced absorption.
Quantitative assessment of the absorption coefficient for the specific Sn-I(-) system.

Main Results:

Collision-induced absorption via long-range electrostatic forces yields intense, symmetrical, and narrow spectral lines.
The forbidden (3)P(0) to (1)S(0) transition in tin is effectively induced by collisions with iodide ions.
The measured absorption coefficient is 0.45%/cm per Torr of Sn and per 0.1 Torr of I(-), with line widths around 15 cm(-1).

Conclusions:

Ion-atom collisions provide a significant mechanism for inducing otherwise forbidden transitions.
The observed spectral characteristics confirm the predictions of linear electrodynamics for this process.
This research quantifies collision-induced absorption, offering valuable data for spectroscopic analysis and plasma physics.