Professor Lineberger is interested in the structure and stability of ions and free radicals, photoelectron spectroscopy of anions, and photophysics and dynamics of cluster ions. The experimental methods all involve the interaction of laser radiation with mass-selected ion beams. Though they all work in concert, the experiments used by Professor Lineberger can be divided in three groups:
First, the absorption of light by a negative ion produces an electron-neutral complex in a total energy state defined by the photon energy. The Lineberger group utilizes this concept in a tunable laser photodetachment machine to probe electron-neutral interactions with unprecedented resolution (10-8 eV). This technique allows the researchers to probe vibration and rotation to electronic coupling, for example, in the autodetachment of PtN. The rotational and vibrational mode dependence of autodetachment rates of dipole bound excited states of C3H2- is another area of current interest.
A second method to probe negative ion structure is via photoelectron spectroscopy of negative ions. This approach also provides direct information on the structure and internal energy of the neutral species produced in the photodetachment process. The group can study species that have only a fleeting existence, such as vinylidene, H2CC. Systems of current interest include diradicals, a variety of carbenes, and transition metal clusters. Future projects include studies of adsorbates on transition metal clusters.
Another area of interest is the photophysics of both positive and negative cluster ions. Photofragmentation of clusters, e.g., (CO2)n+, (CO2)n, I2-(CO2)n and Arn+, has been studied recently. The time-resolved photodissociation and recombination of clusters such as I2-(CO2)n, I2-(N2O)n and I2-(OCS)n are being pursued using femtosecond lasers.
"Ion Chemistry of 1H-1,2,3-Triazole. 2. Photoelectron Spectrum of the Iminodiazomethyl Anion and Collision Induced Dissociation of the 1,2,3-Triazolide Ion," J. Phys. Chem. A 112, 9723–30 (2008), with Takatoshi Ichino, Scott W. Wren, and Veronica M. Bierbaum.
"The vibronic level structure of the cyclopentadienyl radical,” J. Chem. Phys. 129, 084310 (19 pages) 2008, with Takatoshi Ichino, Scott W. Wren, Kristen M. Vogelhuber, Adam J. Gianola, and John F. Stanton.
"Time-resolved photoelectron spectroscopy of photodissociated IBr-(CO2)0-4," in preparation, with Leonid Sheps and Elisa Miller
"Photodissociation Dynamics of IBr-(CO2)n: Solvent-induced trapping in the A' 2π state," J. Chem. Phys. in press (2008), with Matthew A. Thompson, Joshua P. Martin, Joshua Darr, and Robert Parson.
“Gas-Phase Reactions of Halogenated Radical Carbene Anions with Sulfur and Oxygen Containing Species,” Int. J. Mass Spectrom. published on Web (2008), with Stephanie M. Villano, Nicole Eyet, and Veronica M. Bierbaum.
“Gas-Phase Carbene Radical Anions: New Mechanistic Insights, J. Am. Chem. Soc. (Comm. Ed.) 130, 7214-5 (2008), with Stephanie M. Villano, Nicole Eyet, and Veronica M. Bierbaum.
“Ion Chemistry of 1H-1,2,3-Triazole,” J. Phys. Chem B 112, 545-67 (2008), with Takatoshi Ichino, Django H. Andrews, G. Jeffery Rathbone, Fuminori Misaizu, Ryan M. D. Calvi, Scott W. Wren, Shuji Kato, and Veronica M. Bierbaum.
“Thermochemical Studies of N-methylpyrazole and N-methylimidazole,” J. Phys. Chem A 111, 879-887 (2007), with Stephanie M. Villano, Adam J. Gianola, Nicole Eyet, Takatoshi Ichino, Shuji Kato and Veronica M. Bierbaum.
“Negative ion photoelectron spectroscopy of copper hydrides,” Chem Phys. Lett. 442, (12-16) 2007, with Ryan M.D. Calvi and Django H. Andrews.
“Structure of the Vinyldiazomethyl Anion and Energetic Comparison to the Cyclic Isomers,” J Phys. Chem. A 111, 8374-83 (2007), with Takatoshi Ichino, Adam J. Gianola, Shuji Kato, and Veronica M. Bierbaum.
“Femtosecond dynamics of Cu(CD3OD),” J. Chem. Phys. 126, 084307 [10 pages] (2007), with Jack Barbera, Samantha Horvath, Vladimir Dribinski, and Anne B. McCoy.
“Spectroscopic characterization of the isolated SF6 − and C4F8 − anions: Observation of very long harmonic progressions in symmetric deformation modes upon photodetachment.” J. Phys. Chem. A.111, 1214 -1221 (2007), with Joseph Bopp, Joseph Roscioli, Mark Johnson, Thomas Miller, Albert Viggiano, Stephanie Villano and Scott Wren.
“Nonadiabatic effects in the photoelectron spectrum of the pyrazolide-d3 anion: Three-state interactions in the pyrazolyl-d3 radical,” J. Chem. Phys. 125,
“Time-resolved study of solvent-induced recombination in photodissociated IBr−(CO2)n clusters,” J. Chem. Phys. 125, 133405 [7 pages] (2006), with Vladimir Dribinski, Jack Barbera, Joshua P. Martin, Annette Svendsen, Matthew A. Thompson and Robert Parson.
"Photodissociation dynamics of IBr−(CO2)n, n<15", J. Chem. Phys. 122, 054307 (11 pages) (2005), with T. J. Sanford, S.-Y. Han, M. A. Thompson, and R. Parson. S. Taylor, J. Barbera, C.-P. Schulz, F. Muntean, and A. B. McCoy.
“Photoelectron Spectra and Ion Chemistry of Imidazolide,” J. Phys. Chem. A. 109, 1150411514 (2005), with A. J. Gianola, T. Ichino, R. L. Hoenigman, S. Kato, and V. M. Bierbaum.
"Photoelectron Spectroscopy of Phosphorus Hydride Anions", J. Chem. Phys. 122, 054310 [11 pages] (2005), with K. M. Ervin.
"Photoelectron spectroscopy of AuO− and AuS−", J. Phys. Chem. A 108, 11307-13 (2004), with T. Ichino, A. J. Gianola, and D. H. Andrews.
“Thermochemistry and Electronic Structure of the Pyrrolyl Radical,” J. Phys. Chem A. 108, 10326-35 (2004), with A.J. Gianola, T. Ichino, R.L. Hoenigman, S. Kato and V.M. Bierbaum.
“Cluster anions: Structure, interactions, and dynamics in the sub-nanoscale regime,” Phys. Chem. Chem. Phys. 6, 2018-2032 (2004), with Andrei Sanov.
"Time resolved solvent rearrangement dynamics," Faraday Discussions 127, 383-94 (2004), with T. Sanford, D. Andrews, J. Rathbone, M. S. Taylor, F. Muntean, M. Thompson, A. B. McCoy and R. Parson.
W.C. Lineberger, K.M. Ervin, I. Anusiewicz, P. Skurski and J. Simons, "The only stable state of O2- is the X2IIg ground state and it (still!) has an adiabatic electron detachment energy of 0.45 eV", submitted to J. Chem. Phys., (2003).
W.C. Lineberger and A. Sanov, "Dynamics of cluster anions: a detailed look at condensed-phase interactions", PhysChemComm, 5(25), 165-177, (2002).
W.C. Lineberger, M.R. Nimlos, G. Davico, C.M. Geise, P.G. Wenthold, S.J. Blanksby, C.M. Hadad, G.A. Petersson and G.B. Ellison, "Photoelectron spectroscopy of HCCN-and HCNC- reveals the quasilinear triplet carbenes, HCCN and HCNC", J. Chem. Phys., 117, 4323-4339, (2002).
Carl Lineberger, Adam Gianola and Django Andrews, "On the Photoelectron Spectrum of AgO", J. Chem. Phys. 117, 4074-6 (2002).
W.C. Lineberger, X. Duan, L. W. Burggraf, D. E. Weeks, G. E. Davico, and R. L. Schwartz, "Photoelectron spectroscopy of Si2C3- and quantum chemistry of the linear Si2C3 cluster and its isomers", J. Chem. Phys., 116(9), 3601-11 (2002).
W.C. Lineberger, T. M. Ramond, S. J. Blanksby, S. Kato, V. M. Bierbaum, G. E. Davico, R. L. Schwartz, and G. B. Ellison, "The Heat of Formation of the Hydroperoxyl Radical HOO via negative Ions", J. Phys. Chem., 106, 9641-47 (2002).
W.C. Lineberger, T. M. Ramond, G. E. Davico, F. Hellberg, F. Svedberg, P. Salén, and P. Söderqvist, "Photoelectron Spectroscopy of Nickel, Palladium, and Platinum Oxide Anions,"J. Mol. Spectrosc., 216, 1-14, (2002).