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Non-Boltzmann population distributions during single-bubble sonoluminescence.
David J Flannigan1, Kenneth S Suslick
1Department of Chemical Engineering and Materials Science, University of Minnesota , 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States.
The Journal of Physical Chemistry. B
|October 9, 2013
Summary
Single-bubble sonoluminescence (SBSL) in neon-doped sulfuric acid shows varied spectra. Different solutions emit hydroxyl radicals or sulfur monoxide (SO), indicating complex spatial and temporal dynamics within the collapsing bubble.
Area of Science:
- Physical Chemistry
- Acoustics
- Spectroscopy
Background:
- Single-bubble sonoluminescence (SBSL) is a phenomenon involving light emission from collapsing bubbles.
- Aqueous sulfuric acid solutions with dissolved neon are used to study SBSL spectra.
- Variations in emission spectra suggest complex physical processes within the bubble.
Purpose of the Study:
- To investigate the spectral characteristics of SBSL in aqueous sulfuric acid solutions with neon.
- To understand the underlying physical mechanisms responsible for observed spectral differences.
- To explore the spatial and temporal components of SBSL emission.
Main Methods:
- Experimental generation of single bubbles in sulfuric acid solutions of varying concentrations (65 wt% and 80 wt%).
- Spectroscopic analysis of emitted light to identify radical and atomic species.
- Determination of rotational and vibrational temperatures from emission spectra.
- Analysis of population distributions (Boltzmann vs. non-Boltzmann).
Main Results:
- Hydroxyl radical emission observed from 65 wt% solution at 7600 K.
- Sulfur monoxide (SO) emission (Tv = 2400 K, Tr = 280 K) and non-Boltzmann distribution from 80 wt% solution.
- Excited neon atom emission from 80 wt% solution indicates a cooler outer shell (3400 K) with a non-Boltzmann distribution.
Conclusions:
- SBSL emission is influenced by solution composition and exhibits both spatial and temporal characteristics.
- Observed spectral differences are attributed to distinct physical conditions within the sonoluminescent bubble.
- Non-Boltzmann distributions suggest non-equilibrium conditions during bubble collapse.
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