A novel approach for mid-infrared spectroscopy of large carbon systems and the nonthermal fragmentation process of diatomic anions

Jürgen Göck
2020
A novel approach for mid-infrared spectroscopy of large carbon systems and the nonthermal fragmentation process of diatomic anions: The proof-of-principle experiment for Laser Induced Vibrational Emission (LIVE) spectroscopy requires the Cryogenic Trap for Fast ion beams (CTF) to be equipped with a mid-infrared detection system. The novel detection system is based on Blocked Impurity Band (BIB) sensors with a high sensitivity. The detection system requires a low black-body background to avoid
more » ... turation. The sequential installation of radiation shields reduces the black-body background of the CTF substantial. The non-thermal auto-fragmentation process of the diatomic anions of carbon, cobalt and silver is studied at the Cryogenic Storage Ring (CSR). Charged fragments leaving the closed orbit of the CSR are detected by COMPACT at fragment position. Neutral fragments are detected either by NICE or by COMPACT at neutral position. The decay curves which deviate from a simple 1/t power-law are tted and discussed by two approaches. The t function requires the tunneling constants and a distribution of the ro-vibrational states. The tunneling constants were calculated by the program LEVEL16. Both approaches try to nd the distribution of ro-vibrational states by dierent methods. The decay pattern of the diatomic anions are measured up to 1000 s.
doi:10.17617/2.3262723 fatcat:hywm2ad65vamfmaxvvkr7p62uq