TY - JOUR
T1 - Polarization quantum beat spectroscopy of HCF(Ã 1 A″). I. 19F and 1H hyperfine structure and Zeeman effect
AU - Fan, Haiyan
AU - Ionescu, Ionela
AU - Xin, Ju
AU - Reid, Scott A.
PY - 2004/11/8
Y1 - 2004/11/8
N2 - To further investigate the 19F and 1H nuclear hyperfine structure and Zeeman effect in the simplest singlet carbene, HCF, we recorded polarization quantum beat spectra (QBS) of the pure bending levels 2 0 n with n = 0-7 and combination bands 1 0 12 0 n with n= 1-6 and 2 0 n3 0 1 with n= 0-3 in the HCF Ã 1A″ ← X̃ 1A′ system. The spectra were measured under jet-cooled conditions using a pulsed discharge source, both at zero field and under application of a weak magnetic field (<30 G). Analysis yielded the nuclear spin-rotation constants C aa and weak field Lande g aa factors. Consistent with a two-state model, the majority of observed vibrational levels exhibit a linear correlation of C aa and g aa, and our analysis yielded effective (ã) hyperfine constants for the 19F and 1H nuclei (in MHz) of 728(23) and 55(2), respectively. The latter was determined here owing to the high resolving power of QBS. The vibrational state selectivity of the 19F hyperfine constants is discussed, and we suggest that the underlying Renner-Teller interaction may play an important role.
AB - To further investigate the 19F and 1H nuclear hyperfine structure and Zeeman effect in the simplest singlet carbene, HCF, we recorded polarization quantum beat spectra (QBS) of the pure bending levels 2 0 n with n = 0-7 and combination bands 1 0 12 0 n with n= 1-6 and 2 0 n3 0 1 with n= 0-3 in the HCF Ã 1A″ ← X̃ 1A′ system. The spectra were measured under jet-cooled conditions using a pulsed discharge source, both at zero field and under application of a weak magnetic field (<30 G). Analysis yielded the nuclear spin-rotation constants C aa and weak field Lande g aa factors. Consistent with a two-state model, the majority of observed vibrational levels exhibit a linear correlation of C aa and g aa, and our analysis yielded effective (ã) hyperfine constants for the 19F and 1H nuclei (in MHz) of 728(23) and 55(2), respectively. The latter was determined here owing to the high resolving power of QBS. The vibrational state selectivity of the 19F hyperfine constants is discussed, and we suggest that the underlying Renner-Teller interaction may play an important role.
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U2 - 10.1063/1.1803529
DO - 10.1063/1.1803529
M3 - Article
C2 - 15527350
AN - SCOPUS:9744261711
VL - 121
SP - 8869
EP - 8873
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
SN - 0021-9606
IS - 18
ER -