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Infrared studies of ionic clusters: The influence of Yuan T. Lee
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View: Figures


Image of FIG. 1.
FIG. 1.

Vibrational predissociation ion-trap tandem mass spectrometer and infrared laser systems in the Y. T. Lee laboratory (Fig. 1 from Ref. 137).

Image of FIG. 2.
FIG. 2.

Corona discharge source used in the Y. T. Lee laboratory (Fig. 2 from Ref. 17).

Image of FIG. 3.
FIG. 3.

(Color online) Vibrational predissociation -configuration tandem mass spectrometer in the T. R. Rizzo laboratory (Fig. 1 from Ref. 34).

Image of FIG. 4.
FIG. 4.

(Color online) Vibrational predissociation reflectron time-of-flight mass spectrometer and laser vaporization cluster ion source in the M. A. Duncan laboratory (Fig. 1 from Ref. 13).

Image of FIG. 5.
FIG. 5.

The dependence of the infrared spectrum of as a function of corona discharge source backing pressures. Increasing pressure favors the lower energy bridging structure of . Features that disappear are due to the higher energy classical structure (Fig. 5 from Ref. 83).

Image of FIG. 6.
FIG. 6.

Infrared spectrum of using the two color laser vibrational multiphoton dissociation method. The dashed lines correspond to calculated frequencies and intensities for the symmetry structure (Fig. 6 from Ref. 85).

Image of FIG. 7.
FIG. 7.

Vibrational predissociation spectra of (a) and (b) . The asterisks mark the dominant bands in the shared proton vibrational region. The symmetric and asymmetric OH stretching vibrations that are perturbed by the presence of argon are noted (Fig. 1 from Ref. 219).

Image of FIG. 8.
FIG. 8.

(Color) Argon-mediated vibrational predissociation spectra of . Dangling waters are identified by sharp features assigned to the symmetric and asymmetric OH stretches. The sharp band near arises from the bending modes of dangling OH groups. The bands most closely associated with the motions of H atoms bearing the excess charge are highlighted in red. The persistence of the intact Zundel signature in the six- to eight-membered cluster spectra indicates that the excess charge is preferentially retained on one strongly shared proton in this size range. Bands derived from the OH stretches bridging the Zundel ion to the first hydration shell are highlighted in blue, whereas the analogous bands involving the Eigen ion are indicated in green. Spectral features not readily recovered at the harmonic level are denoted with an asterisk (Fig. 3 from Ref. 74).

Image of FIG. 9.
FIG. 9.

(Color online) Vibrational predissociation spectra of , , and in the OH stretching region. The bands associated with the characteristic two- and three-coordinated waters are denoted by D and T, respectively (Fig. 3 from Ref. 133).

Image of FIG. 10.
FIG. 10.

Temperature dependence on the vibrational predissociation spectra of with temperature decreasing from panel (a) to (d). The hydrogen-bonded OH bands associated with four-membered ring dominate at low temperature. The presence of structural isomers at higher temperatures is clearly shown (Fig. 5 from Ref. 138).

Image of FIG. 11.
FIG. 11.

(Color) Calculated lowest-energy structures of for (A) and (B) . The hydronium cation is indicated in blue. For (A) , the free OH responsible for the vibration absent in is indicated in green. Shown in (C) and (D) are calculated frequencies (top) and experimental spectra (middle; Duncan group, bottom: Johnson group) of , (C) and (D) . The calculated spectra (Becke3LYP/aug-cc-pVDZ) were scaled with a factor of 0.962. Peaks were assigned Lorentzian shapes with widths of (Fig. 3 from Ref. 143).

Image of FIG. 12.
FIG. 12.

(Color online) Vibrational predissociation spectra of . Hydrogen-bonded OH stretch band is only observed for (Fig. 3 from Ref. 34).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Infrared studies of ionic clusters: The influence of Yuan T. Lee