Rotationally resolved photoionization of H sub 2 O

Journal Article · Thu Nov 14 23:00:00 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), Journal Name: Journal of Chemical Physics; (United States) Vol. 95:10; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

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