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Conformer-Specific Photoelectron Spectroscopy of Carbonic Acid: H2CO3
Keisuke Kanayama1,2,3, Hisashi Nakamura2, Kaoru Maruta2
1Laboratory for Synchrotron Radiation and Femtochemistry, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
This study characterizes carbonic acid (H2CO3) using advanced spectroscopy, identifying two conformers and their ionization energies. This research aids in understanding its role in various systems and astrochemical reactions.
Area of Science:
- Physical Chemistry
- Astrochemistry
- Spectroscopy
Background:
- Carbonic acid (H2CO3) is crucial in biological, ecological, and astronomical systems.
- Its reactive nature has limited complete spectroscopic characterization.
- Understanding H2CO3 is vital for various scientific disciplines.
Purpose of the Study:
- To obtain detailed spectroscopic characterization of carbonic acid (H2CO3).
- To identify and differentiate between various conformers of H2CO3.
- To determine the ionization energies and enthalpies of formation for H2CO3 conformers.
Main Methods:
- Utilized vacuum ultraviolet (VUV) synchrotron radiation.
- Employed double imaging photoelectron photoion coincidence spectroscopy.
- Obtained photoionization (PI) and mass-selected threshold photoelectron (ms-TPE) spectra.
Main Results:
- Identified two conformers: cis-cis and cis-trans H2CO3.
- Determined experimental adiabatic ionization energies (AIEs) for both conformers.
- Derived cation enthalpies of formation (ΔfH°0K) for cis-cis and cis-trans H2CO3.
Conclusions:
- Spectroscopic data provides insights into vibrational modes of H2CO3 conformers.
- The developed techniques allow for sensitive, conformer-selective detection of H2CO3.
- This research enhances understanding of astrochemical reactions involving carbonic acid.
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