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Title: Near infrared overtone (vOH = 2 ← 0) spectroscopy of Ne–H2O clusters

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4977061· OSTI ID:1535300
 [1];  [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [1]
  1. Univ. of Colorado, Boulder, CO (United States). Dept. of Chemistry and Biochemistry; National Inst. of Standards and Technology (NIST), Boulder, CO (United States). JILA
  2. Univ. Libre de Bruxelles, Brussels (Belgium)
  3. Radboud Univ., Nijmegen (Netherlands). Theoretical Chemistry, Inst. for Molecules and Materials

Vibrationally state selective overtone spectroscopy and dynamics of weakly bound Ne–H2O complexes (D0(para) = 31.67 cm-1, D0(ortho) = 34.66 cm-1) are reported for the first time, based on near infrared excitation of van der Waals cluster bands correlating with vOH = 2 ← 0 overtone transitions (|02-$$\rangle$$←|00+$$\rangle$$ and |02+$$\rangle$$←|00+$$\rangle$$) out of the ortho (101) and para (000) internal rotor states of the H2O moiety. Quantum theoretical calculations for nuclear motion on a high level ab initio potential energy surface (CCSD(T)/VnZ-f12 (n = 3,4), corrected for basis set superposition error and extrapolated to the complete basis set limit) are employed for assignment of Σ←Σ,Π←Σ, and Σ←Π infrared bands in the overtone spectra, where Σ(K = 0) and Π (K = 1) represent approximate projections (K) of the body angular momentum along the Ne–H2O internuclear axis. End-over-end tumbling of the ortho Ne–H2O cluster is evident via rotational band contours observed, with band origins and rotational progressions in excellent agreement with ab initio frequency and intensity predictions. A clear Q branch in the corresponding |02+$$\rangle$$ fΠ(111)←eΣ(000) para Ne–H2O spectrum provides evidence for a novel e/f parity-dependent metastability in these weakly bound clusters, in agreement with ab initio bound state calculations and attributable to the symmetry blocking of an energetically allowed channel for internal rotor predissociation. Lastly, Boltzmann analysis of the rotational spectra reveals anomalously low jet temperatures (Trot ≈ 4(1) K), which are attributed to “evaporative cooling” of weakly bound Ne–H2O clusters and provide support for similar cooling dynamics in rare gas-tagging studies.

Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0002123; FG02-09ER16021
OSTI ID:
1535300
Alternate ID(s):
OSTI ID: 1349363; OSTI ID: 1924542
Journal Information:
Journal of Chemical Physics, Vol. 146, Issue 10; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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Cited By (1)