Very strong Rydberg atom scattering in K(12p)–CH3NO2 collisions: Role of transient ion pair formation

Collisions between K(12p) Rydberg atoms and CH3NO2 target molecules are studied. Whereas CH3NO2 can form long-lived valence-bound CH3NO2− ions, the data provide no evidence for production of long-lived K+⋯CH3NO2− ion pair states. Rather, the data show that collisions result in unusually strong Rydberg atom scattering. This behavior is attributed to ion-ion scattering resulting from formation of transient ion pair states through transitions between the covalent K(12p) + CH3NO2 and ionic K+ + (dipole bound) CH3NO2− terms in the quasimolecule formed during collisions. The ion-pair states are destroyed through rapid dissociation of the CH3NO2− ions induced by the field of the K+ core ion, the detached electron remaining bound to the K+ ion in a Rydberg state. Analysis of the experimental data shows that ion pair lifetimes ≳10 ps are sufficient to account for the present observations. The present results are consistent with recent theoretical predictions that Rydberg collisions with CH3NO2 will result in stron...

[1]  F. Dunning,et al.  Probing dissociative electron attachment through heavy-Rydberg ion-pair production in Rydberg atom collisions. , 2016, The Journal of chemical physics.

[2]  V. Lebedev,et al.  Resonant quenching of Rydberg atomic states by highly polar molecules , 2016 .

[3]  F. Dunning,et al.  Use of heavy-Rydberg ion-pair states to probe dissociative electron attachment , 2015 .

[4]  C. H. Wang,et al.  Probing dissociative electron attachment through formation of heavy-Rydberg ion pair states in Rydberg atom collisions , 2015 .

[5]  C. H. Wang,et al.  Dynamics of heavy-Rydberg ion-pair formation in K(14p,20p)-SF6, CCl4 collisions. , 2014, The Journal of chemical physics.

[6]  V. Lebedev,et al.  Transfer of a weakly bound electron in collisions of Rydberg atoms with neutral particles. I. Long-range interaction effects in the ionic-covalent coupling , 2013 .

[7]  V. Lebedev,et al.  Long-range interaction effects in a formation of dipole-bound anions induced by collisions of Rydberg atoms with polar molecules , 2013 .

[8]  F. Dunning,et al.  Electric-field-induced dissociation of heavy Rydberg ion-pair states. , 2011, The Journal of chemical physics.

[9]  F. Merkt,et al.  Dissociation dynamics of ion-pair states of Cl₂ at principal quantum number beyond 1500 , 2010 .

[10]  C. H. Wang,et al.  Lifetimes of heavy-Rydberg ion-pair states formed through Rydberg electron transfer. , 2010, The Journal of chemical physics.

[11]  C. H. Wang,et al.  Direct observation of K+⋯Cl− heavy-Rydberg ion-pair states formed in K(np)/CCl4 collisions , 2009 .

[12]  F. Dunning,et al.  Formation of heavy-Rydberg ion-pair states in collisions of K(np) Rydberg atoms with attaching targets. , 2009, The Journal of chemical physics.

[13]  W. Ubachs,et al.  Observation of a Rydberg series in H+H-: a heavy Bohr atom. , 2008, Physical review letters.

[14]  F. Dunning,et al.  Lifetime of K+-SF-6 heavy Rydberg states formed by electron transfer in K(np)-SF6 collisions , 2008 .

[15]  F. Dunning,et al.  Electron transfer in collisions of dipole-bound anions with polar targets , 2006 .

[16]  W. Ubachs,et al.  Control of diabatic versus adiabatic field dissociation in a heavy Rydberg system. , 2005, Physical review letters.

[17]  F. Dunning,et al.  Electron transfer in collisions between dipole-bound anions and attaching targets , 2005 .

[18]  E. Reinhold,et al.  Heavy Rydberg states , 2005 .

[19]  F. Dunning,et al.  Dynamics of Rydberg electron transfer to CH3CN: velocity dependent studies. , 2004, The Journal of chemical physics.

[20]  F. Dunning,et al.  Dipole-bound negative ions: Collisional destruction and blackbody-radiation-induced photodetachment , 2003 .

[21]  F. Dunning,et al.  Lifetime of dipole-bound CH3CN− ions: role of blackbody-radiation-induced photodetachment , 2003 .

[22]  F. Dunning,et al.  Nondissociative low-energy electron attachment to SF6, C6F6, C10F8, and c-C7F14: Negative ion lifetimes , 2002 .

[23]  T. Sommerfeld Coupling between dipole-bound and valence states: the nitromethane anion , 2002 .

[24]  W. Ubachs,et al.  Observation of coherent wave packets in a heavy Rydberg system. , 2001, Physical review letters.

[25]  L. Babcock,et al.  Advances in Gas Phase Ion Chemistry , 2001 .

[26]  J. Bergès,et al.  Rydberg electron-transfer spectroscopy and ab initio studies of dimethylsulfoxide–water neutral and anion dimers , 2001 .

[27]  L. Adamowicz,et al.  Dipole-bound anion of 1,3-butanediol. Ab initio and Rydberg electron transfer spectroscopy study , 2001 .

[28]  N. Hammer,et al.  Multipole-bound molecular anions , 2001 .

[29]  Marvin Johnson,et al.  Dipole bound and valence state coupling in argon-solvated nitromethane anions , 2000 .

[30]  James K. Olthoff,et al.  Electron Interactions With SF6 , 2000 .

[31]  C. Desfrançois,et al.  Electron binding to valence and multipole states of molecules: Nitrobenzene, para- and meta-dinitrobenzenes , 1999 .

[32]  R. Bartlett,et al.  A theoretical study of the valence‐ and dipole‐bound states of the nitromethane anion , 1996 .

[33]  H. Abdoul-Carime,et al.  On the binding of electrons to nitromethane: Dipole and valence bound anions , 1996 .

[34]  H. Abdoul-Carime,et al.  GROUND-STATE DIPOLE-BOUND ANIONS , 1996 .

[35]  F. Dunning,et al.  Production and properties of dipole-bound negative ions , 1995 .

[36]  H. Abdoul-Carime,et al.  Dipole Binding to a Strongly Polar Molecule and its Homogeneous Clusters: Magic Distribution of Acetonitrile Cluster Anions , 1994 .

[37]  J. I. Brauman,et al.  Molecular rotation and the observation of dipole‐bound states of anions , 1993 .

[38]  K. A. Smith,et al.  Semiclassical model for analysis of dissociative electron transfer reactions involving Rydberg atoms , 1990 .

[39]  J. Simons Modified rotationally adiabatic model for rotational autoionization of dipole‐bound molecular anions , 1989 .

[40]  D. Clary Photodetachment of electrons from dipolar anions , 1988 .

[41]  N. Djurić,et al.  Absolute detection efficiencies of microchannel plates for 0.1–2.3 keV electrons and 2.1–4.4 keV Mg+ ions , 1986 .