dissociation energy


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dissociation energy

[də‚sō·sē′ā·shən ‚en·ər·jē]
(physical chemistry)
The energy required for complete separation of the atoms of a molecule.
References in periodicals archive ?
(2006) [77] who both directly measured the dissociation energy of water by determining the onset of the dissociative continuum [D.sub.0](HO-H) = 41145.9(0.1) [cm.sup.-1].
As shown in Table 6, there are only two relatively direct measurements leading to a value for the gas phase enthalpy of formation of [H.sub.2][O.sub.2]-the calorimetry measurement of Giguere (1955) [140] and the [D.sub.0](O-O) dissociation energy of Luo et al.
More recently, Lester and coworkers [161-164] measured the vibrational predissociation of H03 putting an upper limit on its bond dissociation energy [D.sub.0](HO-OO) moving the estimate for the enthalpy of formation upward by about (10 to 15) kJ [mol.sup.-1].
The gas phase enthalpy of formation of [H.sub.2][O.sub.2] is also known relatively well (to less than 0.2 kJ [mol.sup.- 1]) being derived largely from a spectroscopic measurement of the [D.sub.0](H0-0H) dissociation energy (with a precision of about 3 [cm.sup.-1]).
Stoicheff, "On the dissociation energy of molecular hydrogen," Can.
Stwalley, "The dissociation energy of the hydrogen molecule using long-range forces," Chem.
Stoicheff, "Dissociation Energy of the hydrogen molecule," Phys.
Herzberg, "Dissociation energy of hydrogen molecule," J.
Kaplan, "Dissociation energy of NO and [N.sub.2]," Physical Review, vol.
Boye, Cray Valley USA, and Ed Terrill, Akron Rubber Development Laboratory Table 1--bond dissociation energies Bond type Dissociation energy (kJ/mol) C-C 335 C-S-C 314 C-S-S-S-C 230 C-[S.sub.x]-C 147 C-O-[Zn.sup.2+]-O-C 293 Table 2--formulation and identification Ingredient Phr SEV PER TMA ZDMA PDM Polyisoprene (IR) 100 100 100 100 100 Zinc oxide 5 Stearic acid 2 TMQ 1 1 1 1 1 Sulfur 3.6 TBBS 4.8 TMA 5 ZDMA 5 PDM 5 Dicumyl peroxide 5 4.6 4.8 1
The reaction mainly attributes to the low dissociation energy of the bond in the epoxy resin structure.
The reactionlessness and higher dissociation energy of the linkage makes the organic structures connected with the nanoparticles can also resist the AO erosion.