Observation of H-2 Aggregation onto a Doubly Charged Anion in a Temperature-Controlled Ion Trap
Hydrogen is the second most difficult gas to be condensed due to its weak intermolecular interactions. Here we report observation of H2 aggregation onto a doubly charged anion, –O2C(CH2)12CO2– (DC2–). Weakly-bound DC2–(H2)n clusters were formed in a temperature-controlled ion trap and studied using photoelectron spectroscopy. The onset of clustering was observed at 30 K, whereas extensive condensation was observed at 12 K with n up to 12. Photoelectron spectra were obtained for DC2–(H2)n (n = 0–6) at 193 and 266 nm. The spectra of DC2–(H2)n were observed to be identical to that of the bare DC2– dianion except a slight blue shift, indicating the weak interactions between H2 and the parent dianion. The blue shift on average amounts to ~34 meV (3.3 kJ/mol) per H2, which represents the lower limit of the H2 binding energy to DC2–.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 949937
- Report Number(s):
- PNNL-SA-63398; 25395; KC0301020; TRN: US200909%%546
- Journal Information:
- Journal of Physical Chemistry A, 112(51):13271-13274, Vol. 112, Issue 51
- Country of Publication:
- United States
- Language:
- English
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