Excited states in the radiation chemistry of gaseous diatomic hydrides

Willis, C.

doi:10.1016/0020-7055(76)90067-x

Cited by 6 publications

(7 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus the net entropy losses which arise from the efTect of this and of changes in the rotational partition functions are not large, for example, -26, -44, and The above findings for HBr and HC1 are highly significant to the present investigation, but we are also particularly interested in the thermochemistry of reactions 5a, 5b, and 5c. Since the total internal energy of the (H)O2-* con~plex is unaltered between its formation in reaction 4 and the instant at which one of (8,50), and here we shall concentrate entirely on hydrogen forming reactions of electrons.…”

Section: (2) Thernzoclj~namic Considerationsmentioning

confidence: 99%

Hydrogen forming reactions of thermal electrons in hydrogen halides: kinetics and thermodynamics

Nagra¹

1976

Can. J. Chem.

View full text Add to dashboard Cite

SURJIT S. NAGRA and DAVID ANTHONY ARMSTRONG. Can. J. Chem. 54, 3580 (1976). New competition kinetic studies of electron reactions in HCl and HBr in the 10Is to 1020 molecule cm-3 concentration region are reported and shown to support the findings of earlier investigations. The capture of thermal electrons by (HX): dimers is examined from a kinetic and thernrodynamic point of view. The (HX)2-'"intermediate previously proposed by several groups is considered to be involved in both systems. Differences in the magnitudes and concentration dependences of the rates can be explained, if reaction 5b is fast (k56 = 1013 s+) in For personal use only.NAGRA AND ARMSTRONG

show abstract

Section: (2) Thernzoclj~namic Considerationsmentioning

confidence: 99%

Hydrogen forming reactions of thermal electrons in hydrogen halides: kinetics and thermodynamics

Nagra¹

1976

Can. J. Chem.

View full text Add to dashboard Cite

show abstract

“…2 is the yield of hydrogen expected from processes other than electron capture occurring in HBr calculated on the assurnption that the energy absorbed by the HBr molecules in the mixture is a linear function of Z . These other processes are mainly dissociations of excited species (9). Curve B is the yield actually observed in the mixtures.…”

Section: Hj-clroge~z Yielclsfroin Electron Cuptlrre Reactionsmentioning

confidence: 95%

“…For xenon [9] has a threshold of 11.16 eV (4). The cross section for Xe*" production by electron impact peaks sharply about 2 eV above this and then falls, until above 60 eV it decreases only slowly with electron energj (8).…”

Section: Ionisafion Processesmentioning

confidence: 99%

“…The magnitude of klo from mass spectrometric measurements ( 8 ) is 9 X I0-l4/cr for 70 eV impacting electrons and 9 X /a for 13 eV impacting electron^.^ Mere cr is gg '(us + ff6). If one assumes cr cx 0.003 and cx 0.03 for 70 eV and E maximum respectively as in argon (8) In the presence of HBr electrons will be captured in reactions 1 and 4 and HBr+ ions will be produced both directly and by auto-ionisation processes (9). The HBri ions may also be expected from the charge transfer reaction 11, since the ionisation potentials of xenon and HBr are [Ill Xe-+ HBr + Xe + IHBr' respectively 12.13 ( 4 ) and 11 .62 eV (10).…”

Section: Ionisafion Processesmentioning

confidence: 99%

“…However, it seerns very unlikely that this would exceed 2 per 100eV. These electrons ivould be expected to possess relatively large cross sections (cJ: data for WCl (17)) for exciting the low lying Q 3Ul, 2nd 3110+ states of HBr (18-%0), which dissociate (18) and produce hydrogert through reaction 18 (9).…”

Section: Hj-clroge~z Yielclsfroin Electron Cuptlrre Reactionsmentioning

confidence: 99%

See 2 more Smart Citations

The xenon sensitised radiolysls of HBr

Nagra¹

1976

Can. J. Chem.

View full text Add to dashboard Cite

SURJIT S. NAGRA and DAVID ANTHONY ARMSTRONG. Can. J. Chem. 54, 3592 (1976).The 60C07,-radiolysis of mixtures of HBr with Xe has been investigated at room temperature. lonisation measurenlents and hgdrogen yields provide strong eLidence for energy transfers between the two components. The small but significant decrease in ionisation yields at low HBr:Xe is independent of total pressure and consistent with a competition between HBr and Xe for the Hornbeck-hlolnar states of Xe. The increase in ionisation lields at higher HBr:Xe ( Z above 0.2) is probably due to collisionally-induced ionisation or chemi-ionisation reactions of highly excited states of HBr.As in pre~iously reported experiments with W2S the hydrogen yields from HBr are strongly enhanced in the presence of Xe. The maximum sensitisation of 4 inolecules of H ? per 100 eV can be explained by energy transfer froni excited states of Xe (G -2.5) and subexcitation electrons having energy between 4.3-8.3 eV (G -1.5) in Xe. The results obtained from thermal electron scavenging with SF6 confirin previous findings that inert gases are inefficient a t moderating electrons to thermal energies. At Iligh [SF6] [HBr]. SF6 interferes with hydrogen-forming reactions other than those of electrons.SURJIT S. NAGRA et DAVID ANTHONY ARMSTRONG. Can. J. Chem. 54, 3592 (1976).

show abstract