Emission spectroscopy of IR laser-induced processes in ultra-dense deuterium D(0): Rotational transitions in D(0) with spin values s = 2, 3 and 4

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• 作者：Leif Holmlid ^{holmlid@chem.gu.se}
• 关键词：Ultra-dense deuterium ; Rotational spectroscopy ; Pulsed laser
• 刊名：Journal of Molecular Structure
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：1130
• 期：Complete
• 页码：829-836
• 全文大小：814 K
• 卷排序：1130

文摘

The emission spectrum induced in ultra-dense deuterium D(0) by a 1064 nm pulsed YAG laser with 0.4 J pulses is strongly dependent on the amount of D(0) formed. With D2 pressure below 10−2 mbar at the D(0) generator and no D(0) layer on the metal surface, line spectra can be observed with numerous lines due to metal and gas atoms. When a D(0) layer exists on the generator surface, these lines disappear. A different pattern of emission lines and bands is then found. Several peaks are observed which agree well with the rotational transitions of rotating D-D pairs in D(0) from theory. The peak widths are approximately 20 cm−1. A prominent peak at 760 nm corresponds to spin state s = 3 in D(0) from a rotational transition J = 1 → 0. This gives an experimental D-D distance in this state of 5.052 ± 0.003 pm that is only 0.25% larger than predicted by theory and calculations. The existence of these rotational lines strongly supports the cluster model of D(0) described previously. At a few hundred mbar pressure, a red-emitting apparently self-focused beam is formed by the laser beam. The expected Balmer lines are weak or absent.