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Multiphoton ionization and photoelectron spectroscopy of formaldehyde via its 3p Rydberg states
 

Summary: Multiphoton ionization and photoelectron spectroscopy of formaldehyde
via its 3p Rydberg states
Jianbo Liu, Ho-Tae Kim, and Scott L. Anderson
Department of Chemistry, University of Utah, 315 S. 1400 E. RM Dock, Salt Lake City, Utah 84112-0850
Received 18 December 2000; accepted 20 March 2001
The resonance-enhanced multiphoton ionization REMPI spectrum of formaldehyde, two photon
resonant in the region of the 1
A2(3px), 1
A1(3py), and 1
B2(3pz) states, is reported. The 1
A2(3px)
state spectrum is dominated by the 3 CH2 scissors , 4 CH2 out-of-plane bending , 5 CH2
asymmetric stretching , and 6 CH2 rock modes, with weaker bands observed for excitation of the
2 CO stretching mode. Vibrational analysis of the spectrum provides many new frequencies for
the 1
A2(3px) state, not resolved or accessible in single photon spectroscopic measurements.
Photoelectron spectroscopy is used to probe the nature of the vibronic levels associated with the
1
A2(3px) intermediate state, to measure vibrational frequencies of the resulting cations, and to
identify useful routes for preparing vibrational state-selected H2CO . It is found that

  

Source: Anderson, Scott L. - Department of Chemistry, University of Utah

 

Collections: Energy Storage, Conversion and Utilization; Materials Science; Chemistry