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https://www.nist.gov/publications/hydrogen-balmer-alpha-line-shapes-hydrogen-argon-mixtures-low-pressure-rf-discharge

Hydrogen Balmer alpha line shapes for hydrogen-argon mixtures in a low-pressure rf discharge | NIST

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https://www.nist.gov/publications/time-resolved-balmer-alpha-emission-fast-hydrogen-atoms-low-pressure-radio-frequency-0

Time-resolved Balmer-Alpha Emission from Fast Hydrogen Atoms in Low Pressure, Radio-Frequency...

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