Full Text Journal Articles by
Author Theofanis N Kitsopoulos

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Following the microscopic pathway to adsorption through chemisorption and physisorption wells.

Dmitriy Borodin, Igor Rahinov, Pranav R Shirhatti, Meng Huang, Alexander Kandratsenka, Daniel J Auerbach, Tianli Zhong, Hua Guo, Dirk Schwarzer, Theofanis N Kitsopoulos, Alec M Wodtke,

Adsorption involves molecules colliding at the surface of a solid and losing their incidence energy by traversing a dynamical pathway to equilibrium. The interactions responsible for energy loss generally include both chemical bond formation (chemisorption) and nonbonding interactions (physisorption). In this work, we present experiments that revealed a quantitative energy ... Read more >>

Science (Science (New York, N.Y.))
[2020, 369(6510):1461-1465]

Cited: 0 times

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Roaming Dynamics in the Photodissociation of Formic Acid at 230 nm.

Yujie Ma, Jiaxing Liu, Fangfang Li, Fengyan Wang, Theofanis N Kitsopoulos,

Roaming dynamics is observed in the photodissociation of formic acid (HCOOH) at 230 nm by using the slice imaging method. In combination with rotational state selective (2 + 1) resonance-enhanced multiphoton ionization of the CO fragments, the speed distributions of the CO fragments exhibit a low recoil velocity at low ... Read more >>

J Phys Chem A (The journal of physical chemistry. A)
[2019, 123(17):3672-3677]

Cited: 1 time

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Fundamental mechanisms for molecular energy conversion and chemical reactions at surfaces.

G Barratt Park, Bastian C Krüger, Dmitriy Borodin, Theofanis N Kitsopoulos, Alec M Wodtke,

The dream of theoretical surface chemistry is to predict the outcome of reactions in order to find the ideal catalyst for a certain application. Having a working ab initio theory in hand would not only enable these predictions but also provide insights into the mechanisms of surface reactions. The development ... Read more >>

Rep Prog Phys (Reports on progress in physics. Physical Society (Great Britain))
[2019, 82(9):096401]

Cited: 1 time

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Velocity-resolved kinetics of site-specific carbon monoxide oxidation on platinum surfaces.

Jannis Neugebohren, Dmitriy Borodin, Hinrich W Hahn, Jan Altschäffel, Alexander Kandratsenka, Daniel J Auerbach, Charles T Campbell, Dirk Schwarzer, Dan J Harding, Alec M Wodtke, Theofanis N Kitsopoulos,

Catalysts are widely used to increase reaction rates. They function by stabilizing the transition state of the reaction at their active site, where the atomic arrangement ensures favourable interactions 1 . However, mechanistic understanding is often limited when catalysts possess multiple active sites-such as sites associated with either the step ... Read more >>

Nature (Nature)
[2018, 558(7709):280-283]

Cited: 1 time

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Assessment of UVA-Riboflavin Corneal Cross-Linking Using Small Amplitude Oscillatory Shear Measurements.

Ioannis M Aslanides, Claudia Dessi, Panagiotis Georgoudis, Georgios Charalambidis, Dimitris Vlassopoulos, Athanassios G Coutsolelos, George Kymionis, Achyut Mukherjee, Theofanis N Kitsopoulos,

The effect of ultraviolet (UV)-riboflavin cross-linking (CXL) has been measured primarily using the strip extensometry technique. We propose a simple and reliable methodology for the assessment of CXL treatment by using an established rheologic protocol based on small amplitude oscillatory shear (SAOS) measurements. It provides information on the average cross-link ... Read more >>

Invest. Ophthalmol. Vis. Sci. (Investigative ophthalmology & visual science)
[2016, 57(4):2240-2245]

Cited: 1 time

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New insights into the photodissociation of methyl iodide at 193 nm: stereodynamics and product branching ratios.

Sonia Marggi Poullain, Marta G González, Peter C Samartzis, Theofanis N Kitsopoulos, Luis Rubio-Lago, Luis Bañares,

The stereodynamics of methyl iodide photodissociation after excitation at 193 nm has been studied using a combination of slice imaging and resonance enhanced multiphoton ionization (REMPI) detection of the methyl and iodine products. A weak anisotropic ring appearing in the image corresponding to vibrationally excited CH3(ν1 = 1) confirms the ... Read more >>

Phys Chem Chem Phys (Physical chemistry chemical physics : PCCP)
[2015, 17(44):29958-29968]

Cited: 1 time

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Slice imaging of methyl bromide photofragmentation at 193 nm.

Fengyan Wang, M Laura Lipciuc, Andreas Kartakoullis, Pavle Glodic, Peter C Samartzis, Xueming Yang, Theofanis N Kitsopoulos,

The photodissociation of methyl bromide at 193 nm is studied using slice imaging. From the measured photofragment translational energy and angular distributions we were able to extract methyl-state-specific dissociation channel yields and crossing probabilities between (3)Q0 and (1)Q1 surfaces. The angular distributions for the Bromine photofragments show a strong dependence ... Read more >>

Phys Chem Chem Phys (Physical chemistry chemical physics : PCCP)
[2014, 16(2):599-606]

Cited: 3 times

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Driving photochemistry by clustering: the ICl-Xe case.

Pavle Glodic, Andreas Kartakoullis, Michal Fárník, Peter C Samartzis, Theofanis N Kitsopoulos,

We present slice imaging data demonstrating the influence of clustering on the photodissociation dynamics of a diatomic molecule: iodine monochloride (ICl) was dissociated at 235 nm in He and Xe seed gasses, probing both Cl and I photofragment energy and angular distributions. We observe that the kinetic energy releases of ... Read more >>

J Chem Phys (The Journal of chemical physics)
[2012, 137(15):154306]

Cited: 3 times

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Ultraviolet photodissociation of iodine monochloride (ICl) at 235, 250, and 265 nm.

N Diamantopoulou, A Kartakoulis, P Glodic, Theofanis N Kitsopoulos, Peter C Samartzis,

ICl photolysis in the ultraviolet region of the spectrum (235-265 nm) is studied using the Slice Imaging technique. The Cl∗((2)P(1/2))/Cl((2)P(3/2)) and the I∗((2)P(1/2))/I((2)P(3/2)) branching ratio between the I((2)P(3/2)) + Cl((2)P(3/2))∕Cl∗((2)P(1/2)) and I∗((2)P(1/2)) + Cl((2)P(3∕/2))∕Cl∗((2)P(1/2)) channels is extracted from the respective iodine and chlorine photofragment images. We find that ground state ... Read more >>

J Chem Phys (The Journal of chemical physics)
[2011, 134(19):194314]

Cited: 2 times

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New insights on the photodissociation of N-methylpyrrole: the role of stereoelectronic effects.

Giovanni Piani, Luis Rubio-Lago, Martin A Collier, Theofanis N Kitsopoulos, Maurizio Becucci,

We investigated the reaction dynamics of N-methylpyrrole (NMP) along the N-CH3 coordinate, upon excitation energies below 6.4 eV. Ours and previous experiments show clearly the existence of different reaction channels leading to slow and fast fragment production whose relative efficiency fluctuates with the changes in the excitation energy. Thanks to ... Read more >>

J Phys Chem A (The journal of physical chemistry. A)
[2009, 113(52):14554-14558]

Cited: 9 times

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Branching ratios and anisotropy parameters in ICl photolysis from 400 to 570 nm using slice imaging.

Peter C Samartzis, Theofanis N Kitsopoulos,

ICl photolysis in the visible region of the spectrum (400-570 nm) is studied using the slice imaging technique. The Cl((2)P(1/2))/Cl((2)P(3/2)) branching ratio between the I((2)P(3/2))+Cl((2)P(3/2)) and I((2)P(3/2))+Cl((2)P(1/2)) channels is extracted from the iodine photofragment images and it is found to range from 0 to 2.5, rising from 570 to 490 ... Read more >>

J Chem Phys (The Journal of chemical physics)
[2010, 133(1):014301]

Cited: 2 times

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Multiphoton dissociation dynamics of CH3Br.

Fengyan Wang, M Laura Lipciuc, Xueming Yang, Theofanis N Kitsopoulos,

The state-resolved photodissociation dynamics of CH3Br+ cations are studied using a combination of slice imaging and velocity mapping. Parent ions are prepared by (2 + 1) two-photon resonant three-photon ionization of CH3Br through the 5s Rydberg state in the energy region 29,069.8-29,976.0 cm(-1). Analysis of the photoelectron spectra reveals that ... Read more >>

Phys Chem Chem Phys (Physical chemistry chemical physics : PCCP)
[2009, 11(13):2234-2240]

Cited: 8 times

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Cluster-controlled photofragmentation: the case of the Xe-pyrrole cluster.

M Laura Lipciuc, Fengyan Wang, Xueming Yang, Theofanis N Kitsopoulos, George S Fanourgakis, Sotiris S Xantheas,

Chemphyschem (Chemphyschem : a European journal of chemical physics and physical chemistry)
[2008, 9(13):1838-1841]

Cited: 6 times

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Imaging photoelectron transmission through self-assembled monolayers: the work-function of alkanethiols coated gold.

Despina Fragouli, Theofanis N Kitsopoulos, Letizia Chiodo, Fabio Della Sala, Roberto Cingolani, Supratim G Ray, Ron Naaman,

In this paper, we present a new approach for studying the electronic properties of self-assembled monolayers and their interaction with a conductive substrate, the low-energy photoelectron imaging spectroscopy (LEPIS). LEPIS relies on imaging of photoelectrons ejected from a conductive substrate and subsequently transmitted through organic monolayers. Using this method, we ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2007, 23(11):6156-6162]

Cited: 7 times

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Imaging the dynamics of gas phase reactions.

Michael N R Ashfold, N Hendrik Nahler, Andrew J Orr-Ewing, Olivier P J Vieuxmaire, Rachel L Toomes, Theofanis N Kitsopoulos, Ivan Anton Garcia, Dmitri A Chestakov, Shiou-Min Wu, David H Parker,

Ion imaging methods are making ever greater impact on studies of gas phase molecular reaction dynamics. This article traces the evolution of the technique, highlights some of the more important breakthroughs with regards to improving image resolution and in image processing and analysis methods, and then proceeds to illustrate some ... Read more >>

Phys Chem Chem Phys (Physical chemistry chemical physics : PCCP)
[2006, 8(1):26-53]

Cited: 127 times

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Photodissociation and photoionization of pyrrole following the multiphoton excitation at 243 and 364.7 nm.

Alrik J van den Brom, Makis Kapelios, Theofanis N Kitsopoulos, N Hendrik Nahler, Bríd Cronin, Michael N R Ashfold,

Photoelectron imaging and time of flight mass spectrometry are used to study the multiphoton ionization and dissociation of pyrrole and its cation following excitation at 243 nm and at 364.7 nm. Our results confirm the 8.2 eV ionization potential of pyrrole and the 9.2 eV ionization threshold for forming the ... Read more >>

Phys Chem Chem Phys (Physical chemistry chemical physics : PCCP)
[2005, 7(5):892-899]

Cited: 15 times

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Measurement of Br photofragment orientation and alignment from HBr photodissociation: production of highly spin-polarized hydrogen atoms.

T Peter Rakitzis, P C Samartzis, R L Toomes, Theofanis N Kitsopoulos,

The orientation and alignment of the (2)P(3/2) and (2)P(1/2) Br photofragments from the photodissociation of HBr is measured at 193 nm in terms of a(q) ((k))(p) parameters, using slice imaging. The A (1)Pi state is excited almost exclusively, and the measured a(q) ((k))(p) parameters and the spin-orbit branching ratio show ... Read more >>

J Chem Phys (The Journal of chemical physics)
[2004, 121(15):7222-7227]

Cited: 18 times

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Imaging the quantum-state specific differential cross sections of HCl formed from reactions of chlorine atoms with methanol and dimethyl ether.

Craig Murray, Andrew J Orr-Ewing, Rachel L Toomes, Theofanis N Kitsopoulos,

Center-of-mass frame scattering angle distributions obtained directly from crossed molecular beam velocity map images are reported for HCl formed in different rotational levels of its vibrational ground state by reaction of Cl atoms with CH3OH and CH3OCH3. Products are observed to scatter over all angles, with peaks in the distribution ... Read more >>

J Chem Phys (The Journal of chemical physics)
[2004, 120(5):2230-2237]

Cited: 9 times

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