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<p>A direct optical absorption diagnostic has been developed for rotationally resolved measurements of diatomic carbon (a<sup>3</sup>Π<sub>u</sub>→d<sup>3</sup>Π<sub>g</sub> (0,0) and (1,1)) at a repetition rate of 525 kHz and resolution of 7.3 pm over the range of 511.1–514.1 nm. The diagnostic utilizes a high-power pulsed continuum laser light source dispersed in a spectrograph and imaged by a high-speed camera. Measurements have been performed that capture the temporal evolution of C<sub>2</sub> number density and temperature of a cloud of carbon black sublimating in shock heated gas at high temperature and pressure (T = 5500 K, <i>P</i> = 3.7 atm). A simultaneous light absorption measurement of the condensed phase enables comparisons of the gaseous C<sub>2</sub> number density to the condensed phase mass. The continuum laser absorption diagnostic is applied to C<sub>2</sub> in this work but shows promise in being a simple “drop-in” system for absorption spectroscopy in the visible range at rapid repetition rates and high dispersion, filling an important gap for laser diagnostic systems.</p>

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Continuum laser absorption spectroscopy of C2(a3Πu) in a sublimating cloud of carbon black

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月29日

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  • Colton Willhardt,
  • Neil Thakker,
  • Nick Son,
  • Adam Hammond-Clements,
  • Kyle Daniel,
  • Nick Glumac

摘要

A direct optical absorption diagnostic has been developed for rotationally resolved measurements of diatomic carbon (a3Πu→d3Πg (0,0) and (1,1)) at a repetition rate of 525 kHz and resolution of 7.3 pm over the range of 511.1–514.1 nm. The diagnostic utilizes a high-power pulsed continuum laser light source dispersed in a spectrograph and imaged by a high-speed camera. Measurements have been performed that capture the temporal evolution of C2 number density and temperature of a cloud of carbon black sublimating in shock heated gas at high temperature and pressure (T = 5500 K, P = 3.7 atm). A simultaneous light absorption measurement of the condensed phase enables comparisons of the gaseous C2 number density to the condensed phase mass. The continuum laser absorption diagnostic is applied to C2 in this work but shows promise in being a simple “drop-in” system for absorption spectroscopy in the visible range at rapid repetition rates and high dispersion, filling an important gap for laser diagnostic systems.