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Note: Cavity enhanced self-absorption spectroscopy: A new diagnostic tool for light emitting matter
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic of a typical CESAS measurement. M1 and M2 are high reflectivity (HR) mirrors, separated by distance L. The light-emitting sample length is given by l. A1 and A2 are apertures, which tailor light through the cavity. Light exiting the cavity is focused onto an optical fiber, OF, connected to the slit of a spectrograph, which contains a charge coupled device (CCD) detector. Light exiting the cavity can also be focused directly into a spectrograph, but this can lead to reduced spectral resolution.

Image of FIG. 2.
FIG. 2.

Spectra of the transient C6H species recorded through expanding hydrocarbon plasma using a supersonic planar plasma source. (a) Optical emission spectrum, I oes, revealing continuous emission and discrete emission features, due to CH emission in the 527.2–528 nm range. (b) Cavity transmission spectrum, I ν , showing both emission features as well as absorption features. The highlighted area contains the electronic origin band transition of C6H and an expanded view is shown in the extracted CESAS absorption spectrum in panel (c). The noise level is indicated. A stick spectrum, simulated for previously reported molecular parameters 14 is incorporated for comparison.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Note: Cavity enhanced self-absorption spectroscopy: A new diagnostic tool for light emitting matter