Total Collision Cross Sections for the Interaction of Atomic Beams of Alkali Metals with Gases

Rothe, Erhard W.; Bernstein, R. B.

doi:10.1063/1.1730662

Cited by 250 publications

(67 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Tables 2, 3, and 4 include values of kc calculated for all the reactions investigated in this study. Values for pD and ci were taken from Rothe and Bernstein (31). The ratio (kexpll/kc)297K is a measure of the reaction probability per collision.…”

Section: Discussionmentioning

confidence: 99%

Gas-phase reactions of anions with halogenated methanes at 297 ± 2 K

Tanaka¹,

Mackay²,

Payzant³

et al. 1976

Can. J. Chem.

210

116

View full text Add to dashboard Cite

. Can. J. Chem. 54, 1643 (1976). The rate constants for a number of exothermic displacement (S,,2) reactions of the type X-+ CH3Y -Y + CH3X where X-= H-, 0 -, C-, F-, S-, CI-, OH-, C,-, C N -, SH-, S,-, C,H-, NHz-. NO,-, C H F -, CH,CI-, C H , B r , C H 3 0 -, CH,S-. and C H , N H and Y = F, CI, and Br, have been measured in the gas phase at 297 f 2 K using the flowing afterglow technique. These gas-phase measurements provided an opportunity to determine the intrinsic nucleophilic reactivity of 'nude' anions and hence to assess the role of solvation in the kinetics of S,,2 reactions proceeding in solution. Comparisons of the experimental rate constants with rate constants calculated using classical theories of capture indicate that several displacement reactions may possess large inrrin.sic energies of activation, E, >> 2 kcal mol-I.Correlations were found between apparent activation energies and the heats of reaction. These correlations provided a convenient classification of the various anion nucleophiles. Displacement was observed to compete with proton transfer in reactions involving nucleophiles of high intrinsic basicity and with hydrogen atom transfer and Hz' transfer in the reactions of the 0-radical anion.

show abstract

Section: Discussionmentioning

confidence: 99%

Gas-phase reactions of anions with halogenated methanes at 297 ± 2 K

Tanaka¹,

Mackay²,

Payzant³

et al. 1976

Can. J. Chem.

210

116

View full text Add to dashboard Cite

show abstract

“…and NH3 were taken from existing compilations (35)(36)(37). The mean polarizabilities of the remaining molecules were calculated from bond and group polarizabilities (36) Fig.…”

Section: H2sch20hcnch3chch2ch30h(ch3)2mentioning

confidence: 99%

Gas-phase proton-transfer reactions of the hydronium ion at 298 K

Tanner¹,

Hopkinson²,

Mackay³

et al. 1979

Can. J. Chem.

View full text Add to dashboard Cite

Rate constants measured with the flowing afterglow technique at 298 ± 2 K are reported for the proton-transfer reactions of H3O+ with CH2O, CH3CHO, (CH3)2CO, HCOOH, CH3COOH, HCOOCH3, CH3OH, C2H5OH, (CH3)2O, and CH2CO. Dissociative proton-transfer was observed only with CH3COOH. The rate constants are compared with the predictions of various theories for ion–molecule collisions. The protonation is discussed in terms of the energetics and mechanisms of various modes of dissociation.

show abstract

“…Calculations using Eq. (13) (15) and (16). A more serious problem is that the value of s is changing rapidly with energy, but in an interesting manner.…”

Section: Resultsmentioning

confidence: 99%

Large Angle Elastic Scattering of Ar+ by He

Chiang

Gislason

Mahan

et al. 1971

The Journal of Chemical Physics

View full text Add to dashboard Cite

Measurement of accurate differential cross sections for systems of the type ``heavy projectile light target'' are shown to be practical, provided measurements are restricted to large center-of-mass scattering angles θ. As an example, cross sections for the system Ar+−He have been measured from θ=60–180° in the energy range 2.7–9.1 eV. Using two-parameter repulsive potentials the results are inverted to yield a potential which reproduces the scattering at all energies. Dramatic evidence is given that potentials of the form V(r)=K/r3 are unsatisfactory for fitting the intermolecular potential in the region of 1–10 eV. The potential derived from these experiments is an average of two molecular potentials, since both the X 2Σand A 2Π states of Ar+−He correlate to ground state atoms. Comparisons are made with theoretical estimates of the two molecular potentials and with the Ar−He+ and Ar−He potentials.

show abstract

Total Collision Cross Sections for the Interaction of Atomic Beams of Alkali Metals with Gases

Cited by 250 publications

References 15 publications

Gas-phase reactions of anions with halogenated methanes at 297 ± 2 K

Gas-phase reactions of anions with halogenated methanes at 297 ± 2 K

Gas-phase proton-transfer reactions of the hydronium ion at 298 K

Large Angle Elastic Scattering of Ar+ by He

Contact Info

Product

Resources

About