Discharge flow-photoionization mass spectrometric study of HOI: Photoionization efficiency spectrum and ionization energy

Journal Article · Thu Nov 09 04:00:00 EST 1995 · Journal of Physical Chemistry

DOI:https://doi.org/10.1021/j100045a013· OSTI ID:174268

Monks, P S; Stief, L J ^[1]; Tardy, D C ^[2]; Liebman, J F ^[3]; Zhang, Z; Kuo, S C; Klemm, R B ^[4]

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1. NASA/Goddard Space Flight Center, Greenbelt, MD (United States)
2. Univ. of Iowa, Iowa City, IA (United States)
3. Univ. of Maryland, Baltimore, MD (United States)
4. Brookhaven National Lab., Upton, NY (United States)

Photoionization efficiency (PIE) spectra of HOI were measured over the wavelength range {lambda} = 115-130 nm and in the ionization threshold region, {lambda} = 123-129 nm, using a discharge flow-photoionization mass spectrometer apparatus coupled to a synchrotron radiation source. HOI was generated, in situ but in varying amounts, by three separate reactions: OH + I{sub 2}; OH + CF{sub 3}I; O({sup 3}P) + C{sub 2}H{sub 5}I. The PIE spectra displayed steplike behavior near threshold, and the HO-I stretching frequency in the cation was determined to be 702 {+-} 60 cm{sup -1}. Even though the present result appears to be the first reported determination of IE(HOI), the experimental value is compared to an estimated value previously derived via a trend analysis and it is considered in terms of trends in the series IE(HOX), where X = F, Cl, Br, and I. Based on the value for IE(HOI) derived in the present study, a value for IE(IO) = 9.66 {+-} 0.10 eV has been predicted. 37 refs., 4 figs., 3 tabs.

• Sponsoring Organization: USDOE
• OSTI ID: 174268
• Journal Information: Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 45 Vol. 99; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
EFFICIENCY
HYPOIODOUS ACID
IODINE COMPOUNDS
IONIZATION POTENTIAL
MASS SPECTRA
PHOTOCHEMICAL REACTIONS
PHOTOIONIZATION