CUED Publications database

Cross sections for rotational decoherence of perturbed nitrogen measured via decay of laser-induced alignment.

Owschimikow, N and Königsmann, F and Maurer, J and Giese, P and Ott, A and Schmidt, B and Schwentner, N (2010) Cross sections for rotational decoherence of perturbed nitrogen measured via decay of laser-induced alignment. J Chem Phys, 133. 044311-.

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Abstract

We quantitatively determine cross sections for rotational decoherence from the decay of nonadiabatic laser-induced alignment in nitrogen and nitrogen-foreign gas mixtures in a temperature range between 80 K and room temperature. The cross section for rotational decoherence in pure nitrogen decreases from 102 A(2) at 80 K to 48 A(2) at 295 K, leading to long-lived coherences even at high temperatures. Comparison with the broadening of the transition lines of the Raman Q-branch reported in the literature shows that the decay of rotational coherence proceeds at the same rate as rotational depopulation. This is verified also for mixtures of nitrogen with hydrogen, helium, argon, and krypton. We discuss limits posed by a possible J-dependence of the cross sections and strategies for state resolved determination from the time-dependent alignment signal.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 11 Oct 2019 20:26
Last Modified: 13 Apr 2021 08:40
DOI: 10.1063/1.3464487