Issue 29, 2022

Coincidence ion pair production (cipp) spectroscopy of diiodine

Abstract

Coincidence ion pair production (I+ + I) (cipp) spectra of I2 were recorded in a double imaging coincidence experiment in the one-photon excitation region of 71 600–74 000 cm−1. The I+ + I coincidence signal shows vibrational band head structure corresponding to iodine molecule Rydberg states Image ID:d2cp01684b-t1.gif crossing over to ion-pair (I+I) potential curves above the dissociation limit. The band origin (ν0), vibrational wavenumber (ωe) and anharmonicity constants (ωexe) were determined for the identified Rydberg states. The analysis revealed a number of previously unidentified states and a reassignment of others following a discrepancy in previous assignments. Since the ion pair production threshold is well established, the electric field-dependent spectral intensities were used to derive the cutoff energy in the transitions to the rotational levels of the 7pσ(1/2) (v′ = 3) state.

Graphical abstract: Coincidence ion pair production (cipp) spectroscopy of diiodine

Supplementary files

Article information

Article type
Paper
Submitted
11 4 2022
Accepted
27 6 2022
First published
29 6 2022
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2022,24, 17569-17576

Coincidence ion pair production (cipp) spectroscopy of diiodine

K. Matthíasson, Á. Kvaran, G. A. Garcia, P. Weidner and B. Sztáray, Phys. Chem. Chem. Phys., 2022, 24, 17569 DOI: 10.1039/D2CP01684B

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