The Dissociative Electroionization of C2H2, C2D2 and C2HD. Investigation of the [C2H(D)]+ and [H(D)]+ Dissociation Channels. The (D)H-C2H(D) binding energy.
Electroionization; Dissociation; Kinetic energy; Appearance energy; C2H(D)+/C2H(D)2; H(D)+/C2H(D)2; Double ionization of C2H2; double ionization of C2H
Abstract :
[en] The dissociative electroionization of C2H2 in the H+ and C2H+ dissociation channels has been extensively investigated in C2H2 and C2D2. The kinetic energy distributions and ionization efficiency curves of both species were examined in detail. The H(D)+ ion shows its lowest onset energy at 18.93+/-0.2 eV whereas the C2H+ is produced at 17.30+/-0.11 eV. For the H+-producing channel the kinetic energy (KE) versus the appearance energy (AE) diagram is obtained, extensively discussed and the bond dissociation energy D(H-C2H)= 5.33+/-0.23 eV is estimated. This value is compared and discussed with respect to the values found in the literature. Predissociation and dissociative autoionization are the dominant H+-producing mechanisms. At high electron energies doubly ionized states of C2H2 are involved. For C2H+, beside the threshold at 17.30+/0.11 eV a new onset at 18.27+/0.10 eV is observed. The ionization efficiency of the doubly ionized molecular ion is observed for the first time in C2HD isotopic species.
Research Center/Unit :
Laboratoire de Dynamique Moléculaire
Disciplines :
Chemistry
Author, co-author :
Davister, M.
Locht, Robert ; Université de Liège - ULiège > Département de Chimie (Faculté des sciences) > Laboratoire de Dynamique Moléculaire (Sciences)
Language :
English
Title :
The Dissociative Electroionization of C2H2, C2D2 and C2HD. Investigation of the [C2H(D)]+ and [H(D)]+ Dissociation Channels. The (D)H-C2H(D) binding energy.
Alternative titles :
[fr] L'électroionisation dissociative de C2H2, C2D2 et C2HD. L'étude des canaux de dissociation de [C2H(D)]+ et [H(D)]+. L'énergie de dissciation (D)H-C2H(D).
Botter, Dibeler, Walker, Rosenstock J. Chem. Phys. 1966, 44:1271.
Dibeler, Walker, McCulloh (1973) Observations on hot bands in the molecular and dissociative photoionization of acetylene and the heat of formation of the ethynyl ion. The Journal of Chemical Physics 59:2264.
Dibeler, Walker Intern. J. Mass Spectrom. Ion Phys. 1973, 11:49.
Eland Intern. J. Mass. Spectrom. Ion Phys. 1979, 31:161.
Maier (1965) Dissociative Ionization of Molecules by Rare-Gas Ion Impact. The Journal of Chemical Physics 42:1790.
Beenakker, De Heer Chem. Phys. 1974, 6:291.
Pang, Ajello, Franklin, Shemansky J. Chem. Phys. 1987, 86:2750.
Ogawa, Tomura, Nakashima, Kawazumi (1988) Translational energy distribution and asymmetry parameter of the excited hydrogen atom produced in e-C2H2 collisions: Dissociation dynamics of acetylene. The Journal of Chemical Physics 88:4263.
Shiromura, Achiba, Kimura, Lee (1987) Determination of the carbon-hydrogen bond dissociation energies of ethylene and acetylene by observation of the threshold energies of proton formation by synchrotron radiation. The Journal of Physical Chemistry 91:17.
Wyatt, Stafford J. Phys. Chem. 1972, 76:1913.
Green, Kinsey, Field J. Chem. Phys. 1989, 91:5160.
Segall, Lavi, Wen, Wittig J. Phys. Chem. 1989, 93:7287.
Iraqi, Petrank, Peres, Lifshitz Intern. J. Mass Spectrom. Ion Processes 1990, 100:679.
Dotan, Iraqi, Lifshitz Intern. J. Mass Spectrom. Ion Processes 1993, 124:R21.
Curtiss, Pople J. Chem. Phys. 1989, 91:2420.
Locht, Schopman Intern. J. Mass Spectrom. Ion Phys. 1974, 15:361.
Servais, Locht, Momigny (1986) A versatile low-cost automation system for an electro-ionization experiment. International Journal of Mass Spectrometry and Ion Processes 71:179.
Lofthus, Krupenie J. Phys. Chem. Ref. Data 1977, 6:113.
Higbie (1991) Uncertainty in the linear regression slope. American Journal of Physics 59:184.
Miller Spectry. Intern. 1991, 3(3):42.
Miller (1991) Spectry. Intern. Spectry. Intern. 3(4):41.
Miller Spectry. Intern. 1991, 3(5):43.
Heald (1992) Uncertainty of the slope for highly correlated data. American Journal of Physics 60:11.
Press, Teukolsky (1992) Fitting Straight Line Data with Errors in Both Coordinates. Computers in Physics 6:274.
Weast C.R.C. handbook of chemistry and physics , CRC Press, Boca Raton; 1984, A113.
Rye, Madey, Houston, Holloway J. Chem. Phys. 1978, 69:1504.
Pople, Frisch, Raghavachari, von R. Schleyer (1982) The structure and stability of the acetylene dication. Journal of Computational Chemistry 3:468.
Burdick, Shields, Appling, Moran Intern. J. Mass Spectrom. Ion Processes 1985, 64:315.
Liegener Chem. Phys. 1985, 92:97.
Ohrendorf, Tarantelli, Cederbaum J. Chem. Phys. 1990, 92:2984.
Appell, Durup (1972) The formation of protons by impact of low energy electrons on water molecules. International Journal of Mass Spectrometry and Ion Physics 10:247.
Muller, Arneberg, Ågren, Manne, Malrnquist, Svensson, Gelius (1982) Theoretical and experimental studies of the valence photoelectron spectrum of C2H2. The Journal of Chemical Physics 77:4895.
Rabrenovic, Herbert, Proctor, Beynon (1983) Hydrocarbon positive ions - a charge-stripping study. International Journal of Mass Spectrometry and Ion Physics 47:125.
Tsai, Eland (1980) Mass spectra and doubly charged ions in photoionization at 30.4 nm and 58.4 nm. International Journal of Mass Spectrometry and Ion Physics 36:143.
Petrongolo, Bruna, Peyerimhoff, Buenker J. Chem. Phys. 1981, 74:4594.
Rosmus, Werner, Reinsch, Larsson J. Electron Spectry. Relat. Phenom. 1986, 41:289.
Okabe, Dibeler (1973) Photon impact studies of C2HCN and CH3CN in the vacuum ultraviolet; heats of formation of C2H and CH3CN. The Journal of Chemical Physics 59:2430.
Chen, Jonas, Hamilton, Green, Kinsey, Field (1988) Acetylene: Isomerization and Dissociation. Berichte der Bunsengesellschaft für physikalische Chemie 92:329.
Fuji, Haijima, Ito (1988) Predissociation of acetylene in à 1Au state. Chemical Physics Letters 150:380.