UV Light Splits Nitrogen Atoms (IMAGE) University of California - San Diego Caption Pairs of nitrogen atoms are more likely to be split by UV light from the Sun and other sources if one or both are the heavier isotope nitrogen-15. In this experiment those heavier atoms combined with hydrogen to form ammonia. Credit UC San Diego Usage Restrictions For use as an illustration for news reports of this finding. For other uses, please contact sinews@ucsd.edu License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.