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Papers by Thomas Rizzo
Physical Review Letters, Jun 22, 2005
Review of Scientific Instruments, May 1, 2006
We describe the use of stimulated Raman pumping in a molecular beam to perform quantum state reso... more We describe the use of stimulated Raman pumping in a molecular beam to perform quantum state resolved gas-surface reactivity measurements for molecules prepared in totally symmetric vibrational states. Vibrational states of homonuclear diatomics as well as totally symmetric vibrations of polyatomic molecules cannot be prepared by direct infrared excitation but are accessible through stimulated Raman pumping by two laser fields when the difference between the incident laser frequencies matches the vibration. We generate a suitable resonant pair of high-energy pump and Stokes laser beams in an injection seeded Raman amplifier filled with the sample gas and equipped with internal gas recirculation. The ability to partially saturate the Raman pumping process in the molecular beam is used to quantify the fraction of vibrationally excited molecules in the irradiated volume, which is needed for quantitative reactivity measurements. We illustrate the method with state resolved reactivity measurements for CH4, prepared in its symmetric C–H stretch vibration on a Ni(100) single crystal surface.
The Analyst
Cryogenic infrared spectra of CID fragments separated by IMS are used to identify human milk olig... more Cryogenic infrared spectra of CID fragments separated by IMS are used to identify human milk oligiosaccharide isomers.
ACS Measurement Science Au, 2021
Journal of the American Chemical Society, Jan 20, 2018
The amino acid serine has long been known to form a protonated "magic-number" cluster c... more The amino acid serine has long been known to form a protonated "magic-number" cluster containing eight monomer units that shows an unusually high abundance in mass spectra and has a remarkable homochiral preference. Despite many experimental and theoretical studies, there is no consensus on a SerH structure that is in agreement with all experimental observations. Here, we present the structure of SerH determined by a combination of infrared spectroscopy and ab initio molecular dynamics simulations. The three-dimensional structure that we determine is ∼25 kcal mol more stable than the previous most stable published structure and explains both the homochiral preference and the experimentally observed facile replacement of two serine units.
The Journal of Physical Chemistry A, 2019
Gordon Research Conferences –Molecular & Ionic Clusters, from April 27 to May 2, 2014, Renaissanc... more Gordon Research Conferences –Molecular & Ionic Clusters, from April 27 to May 2, 2014, Renaissance Tuscany Il Ciocco, in Lucca (Barga), Italy
Journal of the American Chemical Society, 2020
Analytical Chemistry, 2020
Analytical Chemistry, 2020
Review of Scientific Instruments, 2006
We describe the use of stimulated Raman pumping in a molecular beam to perform quantum state reso... more We describe the use of stimulated Raman pumping in a molecular beam to perform quantum state resolved gas-surface reactivity measurements for molecules prepared in totally symmetric vibrational states. Vibrational states of homonuclear diatomics as well as totally symmetric vibrations of polyatomic molecules cannot be prepared by direct infrared excitation but are accessible through stimulated Raman pumping by two laser fields
The Journal of Physical Chemistry Letters, 2018
Journal of The American Society for Mass Spectrometry, 2017
Physical Chemistry Chemical Physics
Experiment and theory unravel the structure and formation mechanism of β-cyclodextrin fragment ions.
The Analyst
We apply high-resolution ion mobility combined with cryogenic infrared spectroscopy to distinguis... more We apply high-resolution ion mobility combined with cryogenic infrared spectroscopy to distinguish isomeric N-glycans with different terminal galactose positions.
Journal of The American Society for Mass Spectrometry
Physical Review Letters, Jun 22, 2005
Review of Scientific Instruments, May 1, 2006
We describe the use of stimulated Raman pumping in a molecular beam to perform quantum state reso... more We describe the use of stimulated Raman pumping in a molecular beam to perform quantum state resolved gas-surface reactivity measurements for molecules prepared in totally symmetric vibrational states. Vibrational states of homonuclear diatomics as well as totally symmetric vibrations of polyatomic molecules cannot be prepared by direct infrared excitation but are accessible through stimulated Raman pumping by two laser fields when the difference between the incident laser frequencies matches the vibration. We generate a suitable resonant pair of high-energy pump and Stokes laser beams in an injection seeded Raman amplifier filled with the sample gas and equipped with internal gas recirculation. The ability to partially saturate the Raman pumping process in the molecular beam is used to quantify the fraction of vibrationally excited molecules in the irradiated volume, which is needed for quantitative reactivity measurements. We illustrate the method with state resolved reactivity measurements for CH4, prepared in its symmetric C–H stretch vibration on a Ni(100) single crystal surface.
The Analyst
Cryogenic infrared spectra of CID fragments separated by IMS are used to identify human milk olig... more Cryogenic infrared spectra of CID fragments separated by IMS are used to identify human milk oligiosaccharide isomers.
ACS Measurement Science Au, 2021
Journal of the American Chemical Society, Jan 20, 2018
The amino acid serine has long been known to form a protonated "magic-number" cluster c... more The amino acid serine has long been known to form a protonated "magic-number" cluster containing eight monomer units that shows an unusually high abundance in mass spectra and has a remarkable homochiral preference. Despite many experimental and theoretical studies, there is no consensus on a SerH structure that is in agreement with all experimental observations. Here, we present the structure of SerH determined by a combination of infrared spectroscopy and ab initio molecular dynamics simulations. The three-dimensional structure that we determine is ∼25 kcal mol more stable than the previous most stable published structure and explains both the homochiral preference and the experimentally observed facile replacement of two serine units.
The Journal of Physical Chemistry A, 2019
Gordon Research Conferences –Molecular & Ionic Clusters, from April 27 to May 2, 2014, Renaissanc... more Gordon Research Conferences –Molecular & Ionic Clusters, from April 27 to May 2, 2014, Renaissance Tuscany Il Ciocco, in Lucca (Barga), Italy
Journal of the American Chemical Society, 2020
Analytical Chemistry, 2020
Analytical Chemistry, 2020
Review of Scientific Instruments, 2006
We describe the use of stimulated Raman pumping in a molecular beam to perform quantum state reso... more We describe the use of stimulated Raman pumping in a molecular beam to perform quantum state resolved gas-surface reactivity measurements for molecules prepared in totally symmetric vibrational states. Vibrational states of homonuclear diatomics as well as totally symmetric vibrations of polyatomic molecules cannot be prepared by direct infrared excitation but are accessible through stimulated Raman pumping by two laser fields
The Journal of Physical Chemistry Letters, 2018
Journal of The American Society for Mass Spectrometry, 2017
Physical Chemistry Chemical Physics
Experiment and theory unravel the structure and formation mechanism of β-cyclodextrin fragment ions.
The Analyst
We apply high-resolution ion mobility combined with cryogenic infrared spectroscopy to distinguis... more We apply high-resolution ion mobility combined with cryogenic infrared spectroscopy to distinguish isomeric N-glycans with different terminal galactose positions.
Journal of The American Society for Mass Spectrometry