4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=10&confId=86">The Proceedings of SAIP2016</a> published on 24 December 2017

Excitation spectroscopy with vibration selective detection for self-absorption free rovibronic spectra of CO

6 Jul 2016, 10:00
20m
5C (Kramer Law building)

5C

Kramer Law building

UCT Middle Campus Cape Town
Oral Presentation Track C - Photonics Photonics

Speaker

Mr Andre de Bruyn (Laser Research Institute, Stellenbosch University)

Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

In this project the excitation and fluorescence wavelengths for carbon monoxide (CO) in the VUV region are investigated. The narrow spectral bandwidth of the light of our tunable VUV laser source (yielding high spectral resolution and high spectral brightness) allows detection of the fluorescence from weakly absorbing transitions, such as forbidden transitions (FT) of 12C16O. The weak spectral lines of CO are important in astrophysics and laboratory data is lacking. Flow-cooling of CO in a supersonic jet makes it possible to do spectroscopy in conditions similar to conditions in space: collision-free and at temperatures down to a few Kelvin.

By incorporating a scanning monochromator into the existing system we recorded the CO fluorescence spectrum upon VUV excitation and measured self-absorption free rotational excitation spectra of CO in the VUV region. This information was used to accurately determine the temperature of the supersonic jet gas sample. Using the monochromator it was possible to increase the spectral resolution from 0.93 pm to 0.42 pm. The upgraded system has excellent potential for recording of weak forbidden transitions of CO and other molecular gases.

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

No

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD, N/A)?

MSc

Please indicate whether<br>this abstract may be<br>published online<br>(Yes / No)

Yes

Apply to be<br> considered for a student <br> &nbsp; award (Yes / No)?

Yes

Main supervisor (name and email)<br>and his / her institution

CM Steenkamp, (cmsteen@sun.ac.za), SU

Primary author

Mr Andre de Bruyn (Laser Research Institute, Stellenbosch University)

Co-authors

Dr Anton du Plessis (Stellenbosch University) Dr Christine Steenkamp (University of Stellenbosch) Prof. Erich Rohwer (University of Stellenbosch)

Presentation Materials

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