The formation of high-n Rydberg atoms from the neutral dissociation of superexcited states of I2 formed by resonant two-photon excitation of molecular iodine using an ArF laser has been investigated. The high-n Rydberg atoms I* are formed by predissociation of the optically excited molecular Rydberg states I2 * RB 2g + converging on the I2 +B 2g + state of the ion. Measurement of the kinetic energy release of the Rydberg I* fragments allowed the identification of the asymptotic channels as I*R3PJ+I2P3/2, where the I*R3PJ are Rydberg atoms converging on the I+3PJ states of the ion with J=2, 1, and 0. In the case of the I*R3P2 fragments, the average Rydberg lifetime is observed to be 325±25 s. Based on experiments on the variation of the Rydberg atom signal with the field ionizing strength, the distribution of Rydberg levels peaks at about 25–50 cm−1 below the ionization limit.
Neutral photodissociation of superexcited states of molecular iodine / P., O'Keeffe; Stranges, Domenico; P. L., Houston. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - STAMPA. - 127:(2007), pp. 144309-1-144309-7. [10.1063/1.2777160]
Neutral photodissociation of superexcited states of molecular iodine
STRANGES, Domenico;
2007
Abstract
The formation of high-n Rydberg atoms from the neutral dissociation of superexcited states of I2 formed by resonant two-photon excitation of molecular iodine using an ArF laser has been investigated. The high-n Rydberg atoms I* are formed by predissociation of the optically excited molecular Rydberg states I2 * RB 2g + converging on the I2 +B 2g + state of the ion. Measurement of the kinetic energy release of the Rydberg I* fragments allowed the identification of the asymptotic channels as I*R3PJ+I2P3/2, where the I*R3PJ are Rydberg atoms converging on the I+3PJ states of the ion with J=2, 1, and 0. In the case of the I*R3P2 fragments, the average Rydberg lifetime is observed to be 325±25 s. Based on experiments on the variation of the Rydberg atom signal with the field ionizing strength, the distribution of Rydberg levels peaks at about 25–50 cm−1 below the ionization limit.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
