Dalian Coherent Light Source reveals hydroxyl super rotors from water photochemistry

Hydroxyl super rotors produced from water photochemistry by using Dalian Coherent Light Source, the process of which is ubiquitous in the interstellar space. Credit: YUAN Kaijun

Hydroxyl (OH) is a key radical in interstellar oxygen chemistry due to its capacity to react with most gases in the interstellar medium. OH radicals with extraordinarily high rotational levels of excitation were observed by astronomers in emission from HH 211(one of the youngest known stellar outflows) and the T Tauri star DG Tau.

It is very unlikely such rotationally “hot” OH radicals would be formed from any chemical reactions, but they could originate from short wavelength photolysis of H2O. In the present work, the production mechanism of rotationally hot OH radicals was identified by systematic studies of vacuum ultraviolet (VUV) water photochemistry.

“The advent of the intense, pulsed VUV free electron laser at the DCLS opens the way for state-of-the-art molecular photodissociation dynamics studies at any user-selected VUV wavelength,” said YUAN.

“Highly rotationally excited OH radicals, so-called 'super rotors' existing above the bond dissociation energy, were observed from the photodissociation of water at 115.2 nm. Such peculiar dissociation dynamics were only observed at around 115.2 nm, which reveals interesting dissociation mechanisms,” YUAN added.

The free electron laser facility provides a chance to investigate the VUV photochemistry of small molecules. The dissociation processes of these molecules are ubiquitous in interstellar space and should be recognized in appropriate interstellar chemistry models.

###

The research work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences, the Chemical Dynamics Research Center, and the National Natural Science Foundation of China.

Media Contact

WANG Yongjin
wangyj@dicp.ac.cn

http://english.cas.cn/ 

Media Contact

WANG Yongjin EurekAlert!

All news from this category: Life Sciences

Articles and reports from the Life Sciences area deal with applied and basic research into modern biology, chemistry and human medicine.

Valuable information can be found on a range of life sciences fields including bacteriology, biochemistry, bionics, bioinformatics, biophysics, biotechnology, genetics, geobotany, human biology, marine biology, microbiology, molecular biology, cellular biology, zoology, bioinorganic chemistry, microchemistry and environmental chemistry.

Back to the Homepage

Comments (0)

Write comment

Latest posts

Seawater as an electrical cable !?

Wireless power transfers in the ocean For drones that can be stationed underwater for the adoption of ICT in mariculture. Associate professor Masaya Tamura, Kousuke Murai (who has completed the…

Rare quadruple-helix DNA found in living human cells with glowing probes

New probes allow scientists to see four-stranded DNA interacting with molecules inside living human cells, unravelling its role in cellular processes. DNA usually forms the classic double helix shape of…

A rift in the retina may help repair the optic nerve

In experiments in mouse tissues and human cells, Johns Hopkins Medicine researchers say they have found that removing a membrane that lines the back of the eye may improve the…

Partners & Sponsors

By continuing to use the site, you agree to the use of cookies. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.

Close