The infrared absorption spectra and vibrational assignment of difluorodiiodomethane

McAlpine, Irene Mary; Sutcliffe, H.

doi:10.1016/0584-8539(69)80161-3

Cited by 12 publications

(3 citation statements)

References 5 publications

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“…32 Our PTS results suggested a value of ␣ Ϸ60°but also indicated that it may be necessary to take into account the instantaneous distribution of angles due to the amplitude of the low frequency I-C-I bend. 33 In summary, we have developed a forward convolution analysis procedure which has the capability to include all the contributions active in the photodissociation of CF 2 I 2 . This procedure provides the weights of the individual decay processes as well as their c.m.…”

Section: Discussionmentioning

confidence: 99%

Resonance enhanced multiphoton ionization time-of-flight study of CF2I2 photodissociation

Bergmann

Carter

Hall

et al. 1998

The Journal of Chemical Physics

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Resonance enhanced multiphoton ionization/time-of-flight measurements of the velocity and internal energy content of thermal and photochemical methyl radical sources Rev.The resonance enhanced multiphoton ionization time-of-flight ͑REMPI-TOF͒ technique was applied to study the complex dissociation of CF 2 I 2 in a supersonic expansion. Using nanosecond excitation at 248, 266, and 304 nm and probing the I 3/2 and/or I 1/2 photoproducts, we determined the photofragment speed distribution, the recoil anisotropy parameter ␤ and the branching ratio for each of the decay channels. At 248 nm the dissociation proceeds according to a concerted three-body decay, CF 2 I 2 → h CF 2 ϩI 1/2 ϩI 3/2 ͑90%͒ or CF 2 I 2 → h CF 2 ϩI 3/2 ϩI 3/2 ͑10%͒ consistent with our previous results obtained from photofragment translational spectroscopy. At 304 nm three competing decay channels were found to be operative. In decreasing order of branching, these are: two-body decay to CF 2 I ϩI 1/2 , sequential three-body decay CF 2 I 2 → h CF 2 I ϩ I 3/2 →CF 2 ϩ I 3/2 ϩI 3/2 , and a concerted three-body decay yielding CF 2 ϩI 3/2 ϩI 3/2 . The positive, almost maximum ␤ values observed for all the primary steps in the 248, 266 and 304 nm photodissociation imply that the excited states which subsequently lead to dissociation are exclusively of B 1 symmetry and that the primary bond-breaking processes occur on a subpicosecond time scale.

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Section: Discussionmentioning

confidence: 99%

Resonance enhanced multiphoton ionization time-of-flight study of CF2I2 photodissociation

Bergmann

Carter

Hall

et al. 1998

The Journal of Chemical Physics

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“…Only one transition is observed and it lies within 3 cm-' of the liquidphase C-F symmetric stretch of CF,I, (Table l). 24 Other bands with equivalent intensity in the liquid phase, most notably the C-F antisymmetric stretch at 1110 cm-' and the C-I antisymmetric stretch at 740 cm-', are absent in Fig. 8.…”

Section: Structure Of Cf212mentioning

confidence: 91%

Electron-stimulated chemistry of CF₃I adsorbed on Ag(111) C—F bond cleavage and C—C coupling

Fieberg¹,

Szabó²,

White³

1996

J. Chem. Soc., Faraday Trans.

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“…Only available spectral data for CFzlz are from,the infrared spectrum in the gaseous' state by McAlpine and Sutcliff [55]. In their assignment the five low lying fundamental frequencies were obtained from overtones and combination bonds.…”

Section: Difluorochlorobromomethane (Cf 2 Cibr)mentioning

confidence: 99%

Ideal gas thermodynamic properties of CH4−(a+b+c+d)FaClbBrcId Halomethanes

Kudchadker

1978

Journal of Physical and Chemical Reference Data

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Densities of liquid CH4−a X a (X=Br,I) and CH4−(a+b+c+d)F a CI b Br c I d halomethanesThe availa,ble molecular parameters, fundamental frequencies, and enthalpies of formation at 298.15K (llHr(298}) for halomethanes of the type CH4-(a+b+c+dlFaClr,BrcId have been critically evaluated and recommended values selected. Molecular parameters and llHfO(298) for some halomethanes have been estimated as the experimental values for these compounds are not available. This information has been utilized to calculate the ideal gas thermodynamic properties C;, So, HO-H~,-(Go-H~)/T, llHr, ;lOr, and logKf from o to 1500 K and at a pressure of one atmosphere using the rigid rotor-harmonic oscillator approximation for the following compounds: CHzFBr, T~h h~ If the values for angle YCY in CY:;:W2 ano {l.ngle ZCZ in CZ 2 W2 are available, then LYCZ= 1j2( LYCY + LZCZ). (2) Bond angle XCZ: Very few. values are available for LXCZ in halomethanes having two X atoms. Hence values of LXCZ angles

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The infrared absorption spectra and vibrational assignment of difluorodiiodomethane

Cited by 12 publications

References 5 publications

Resonance enhanced multiphoton ionization time-of-flight study of CF2I2 photodissociation

Resonance enhanced multiphoton ionization time-of-flight study of CF2I2 photodissociation

Electron-stimulated chemistry of CF₃I adsorbed on Ag(111) C—F bond cleavage and C—C coupling

Ideal gas thermodynamic properties of CH4−(a+b+c+d)FaClbBrcId Halomethanes

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The infrared absorption spectra and vibrational assignment of difluorodiiodomethane

Cited by 12 publications

References 5 publications

Resonance enhanced multiphoton ionization time-of-flight study of CF2I2 photodissociation

Resonance enhanced multiphoton ionization time-of-flight study of CF2I2 photodissociation

Electron-stimulated chemistry of CF3I adsorbed on Ag(111) C—F bond cleavage and C—C coupling

Ideal gas thermodynamic properties of CH4−(a+b+c+d)FaClbBrcId Halomethanes

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Electron-stimulated chemistry of CF₃I adsorbed on Ag(111) C—F bond cleavage and C—C coupling