Rotationally resolved photoionization of H sub 2 O

Journal Article · Fri Nov 15 00:00:00 EST 1991 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.461431· OSTI ID:5102308

Tonkyn, R G ^[1]; Wiedmann, R; Grant, E R ^[2]; White, M G ^[1]

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1. Chemistry Department, Brookhaven National Laboratory, Upton, New York (USA)
2. Chemistry Department, Purdue University, West Lafayette, Indiana (USA)

A rotationally resolved one-photon threshold photoionization spectrum of jet-cooled water (H{sub 2}O and D{sub 2}O) has been obtained by pulsed field ionization of extremely high-{ital n} Rydberg states. Observed spectral intensities for both vibrationless (0,0,0) and vibrationally excited (1,0,0) water cation show a strong propensity for {Delta}{ital N}=0, {plus minus}1 transitions. In contrast to earlier work on O{sub 2} and HCl, the lack of large {Delta}{ital N} transitions suggests that ionization occurs with only small angular momentum transfers between the core and photoelectron. The presence of both type A and type C symmetric top'' transitions varies from the conclusions of a recent MQDT analysis of H{sub 2}O photoionization, which predicts only type C transitions. Rotational analysis of the spectra yields improved ionization potentials for both H{sub 2}O and D{sub 2}O. The ionization potential of the (1,0,0) vibrational level provides a direct measurement of the symmetric stretch fundamental in H{sub 2}O{sup +} which is in excellent agreement with an earlier indirect determination. Room temperature spectra are presented for ionization into the (0,0,0), (0,1,0), and (1,0,0) vibrational levels of H{sub 2}O{sup +}.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5102308
• Journal Information: Journal of Chemical Physics; (United States), Vol. 95:10; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
WATER
PHOTOIONIZATION
ANGULAR MOMENTUM
COOLING
DEUTERATION
EXCITATION
IONIZATION POTENTIAL
JETS
MEDIUM TEMPERATURE
MOMENTUM TRANSFER
PULSES
RESOLUTION
ROTATIONAL STATES
RYDBERG STATES
THRESHOLD ENERGY
VIBRATIONAL STATES
CHEMICAL REACTIONS
ENERGY
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
HYDROGEN COMPOUNDS
IONIZATION
OXYGEN COMPOUNDS
640302* - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory