The field-ionization of near-dissociation ion-pair states of I[sub 2]

Ridley, T.; de Vries, M.; Lawley, K. P.; Wang, S.; Donovan, R. J.
October 2002
Journal of Chemical Physics;10/15/2002, Vol. 117 Issue 15, p7117
Academic Journal
Using a resonant multiphoton excitation pathway, it is shown that electronic states down to 30 cm[SUP-1] below the first ion-pair dissociation threshold of I[SUB2] can be efficiently converted from initially prepared well-defined low-J states to long-lived (τ[SUBd]>4 μs), subthreshold zero ion kinetic energy (ZIKE) ion-pair states which are analogous to high, zero electron kinetic energy, Rydberg states. A pulsed electric field is used to dissociate the ZIKE states and produce free-ion pairs (i.e., I[SUP+] +I[SUP-] ). Direct excitation to very high vibrational levels of the ion-pair states is ruled out and polarization data are used to probe the spectroscopic character of the doorway states to free-ion formation. The ion-pair dissociation limit, determined from the extrapolation to zero field of the onset of the prompt I[SUP+]/I[SUP-] signal, agrees well with the literature value.


Related Articles

  • Semiclassical treatment of charge transfer in molecule-surface scattering. Bach, Christian; Groß, Axel // Journal of Chemical Physics;4/8/2001, Vol. 114 Issue 14 

    We have treated the ionization probability of iodine molecules scattered from diamond by a semiclassical surface hopping scheme, namely Tully's fewest-switches algorithm [J. Chem. Phys. 93, 1061 (1990)]. The interaction is described by a model potential that has been adjusted to empirical data....

  • High lying gerade Rydberg states of molecular iodine. Wu, Ming; Johnson, Philip M. // Journal of Chemical Physics;1/1/1989, Vol. 90 Issue 1, p74 

    Two new (2+1) multiphoton ionization spectra of gerade Rydberg states of molecular iodine are observed in the 310.0–322.5 and the 285.5–295.5 nm ranges. These spectra were obtained in both a conventional MPI cell and in a TOF molecular beam apparatus. A long progression in the...

  • Time-resolved laser optogalvanic spectroscopy of iodine in a radio frequency discharge. Kumar, D.; Clancy, P. L.; McGlynn, S. P. // Journal of Chemical Physics;4/15/1989, Vol. 90 Issue 8, p4008 

    Pulsed laser optogalvanic (LOG) spectra of iodine vapor in a ∼32 MHz rf discharge were excited at 14 900–17 100 cm-1. Two distinct, time-resolved components were observed: a fast component, synchronous with the laser pulse, width ∼1 μs, followed by a slow component, width...

  • Quantum control of the yield of a chemical reaction. Pastirk, Igor; Brown, Emily J. // Journal of Chemical Physics;3/15/1998, Vol. 108 Issue 11, p4375 

    Investigates the order of magnitude enhancement in the pathway leading to iodine ion product formation in the photodissociation reaction of CH[sub 2]I[sub 2]. Use of positively chirped 312 nm femtosecond laser pulses; Result of multiphoton excitation; Influence of laser pulses wavelength and...

  • Luminescence of CuGaS2. Massé, George // Journal of Applied Physics;7/15/1985, Vol. 58 Issue 2, p930 

    Examines the luminescence of single crystals of CuGaS[sub2] grown by iodine-vapor transport. Energy levels and active defects of CuGaS[sub2]; Luminescence from as-grown crystals at liquid-helium temperature; Evaluation of the ionization energies of the impurities involved.

  • Dissociative ionization of ICl studied by ion imaging spectroscopy. Yamada, Hidetaka; Taniguchi, Nori; Kawasaki, Masahiro; Matsumi, Yutaka; Gordon, Robert J. // Journal of Chemical Physics;7/15/2002, Vol. 117 Issue 3, p1130 

    The speed and angular distributions of I[sup +] ions, produced when IC1 molecules were exposed to both ultraviolet and visible radiation at 304+608 nm, 355+608 nm, and 304+532 nm, were measured by velocity map imaging. An intense central feature in the I[sup +] images was observed to be very...

  • Autoionization in I and I[sub 2] observed by multiphoton ionization and photoelectron spectroscopy: Two atomic iodine Rydberg series built on the ...5s[sup 2]5p[sup 4] [sup 3]P[sub 1] ion core and revised value for the I[sup +]([sup 3]P[sub 1]) limit. Gu, Y.-Y.; Chojnacki, A. M.; zietkiewicz, C. J.; Senin, A. A.; Eden, J. G. // Journal of Chemical Physics;12/15/2003, Vol. 119 Issue 23, p12342 

    Two well-developed Rydberg series of atomic iodine, built on the ...5s[sup 2]5p[sup 4] [sup 3]P[sub 1] ion core and assigned to nd[2][sub 5/2] and ns[1][sub 3/2] states with principal quantum numbers as high as n=47, have been observed by two photon (566≤λ≤600 nm) ionization of...

  • Relativistic and correlated calculations on the ground, excited, and ionized states of iodine. de Jong, W.A.; Visscher, L. // Journal of Chemical Physics;12/1/1997, Vol. 107 Issue 21, p9046 

    Studies the electronic structure, spectroscopic and bonding properties of the ground, excited and ionized states of iodine. Influence of relativity and correlation on the spectroscopic properties; Potential energy curves for excited states; Spectrum of ionized states that dissociate.

  • Modulation of resonant multiphoton ionization of CH3I by laser phase variation. Xing, Guoqiang; Wang, Xuebin; Huang, Xin; Bersohn, Richard; Katz, Benjamin // Journal of Chemical Physics;1/15/1996, Vol. 104 Issue 3, p826 

    The phase control of molecular absorption, first proposed by Shapiro, Hepburn, and Brumer was accomplished with CH3I using the technique of Chen, Yin, and Elliott. Red light (λ near 603 nm) was focused in a cell containing CH3I gas at a pressure around 1 Torr. The emerging light, a coherent...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics