Low-energy electron scattering by atomic hydrogen: III. Comparison of theory and experiment for the electron-induced excitation of hydrogen to the<i>n</i>= 2 level

Burke, P G; Taylor, Antoinette; Ormonde, Stephan

doi:10.1088/0370-1328/92/2/310

Cited by 49 publications

(12 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Th e mos t interes tin g feature of the threshold work was th e plateau in Q.l near the threshold, which is consis te nt with a finite value of Q.l at thres hold. In addition to the agreement with theory pre viously noted [Chamberlain e t aI., 1964] th ese r es ults have been found to be in good agreem e nt with rece nt calculation s by Burke, Ormond e, and Whitaker [1966] and by Burke , Taylor, and Ormonde [1967] , as c an be seen in figure 5.…”

Section: Threshold Datasupporting

confidence: 78%

See 1 more Smart Citation

Electron impact excitation of hydrogen Lyman-a radiation

Long¹,

Cox²,

Smith³

1968

J. RES. NATL. BUR. STAN. SECT. A.

105

View full text Add to dashboard Cite

A n experim e ntal inv es ti ga tion of e lec tro n imp ac t exc it a tion of th e 2p stat e of atomic hydrogen is desc ribed. A bea m o f e lec tron s wa s passed thruu g h a c hopp ed bea m of hydrogeil atoms in a high vacuum apparatus. Th e modulated flux of Lyman -a photons e mitted in the radiative decay of the . 2p s tatc wa s ta ke n as a meas ure me nt of th e excita tion probabilit y res ulting from d irect exc itation plus indirec t exc itation rcs ultin g from cascad in g. The region s urrounding th e inte rsec tion of the two beams was e lec tri ca ll y and mag ne ti ca ll y s hi e lded to p re ve nt qu e n c hing of me tastabl e 25 atoms a nd th ere b y to e ns ure that th e ob se rv ed Lyman-a flu x res ult ed from d ecay of th e s hort-live d 2p s tate.Th e experim e nt a l res ult s are consist e nt with th ose ob tained by F ite , S te bbin gs, and Brac kmann '[19591 , and co nfirm th e ex is te nce of a large di sc repa ncy be twee n th co re ti ca l a nd ex per im enta l res ult s in th c e lec tron e nergy range below 50 c V.,." .< Key Words: Atomic h ydroge n; beams; e lectron impa ct exc itation ; e xperimen ta l; hi gh vacuum;Lyman-a.

show abstract

Section: Threshold Datasupporting

confidence: 78%

“…(2) Over th e s mall electron e nergy and consequent gu n voltage ranges, there we re no significant c hanges in th e following parameters: Chamberlain, Smith and Heddle [1964], 6; by Fite,Stebbings,and Brackmann [/ 959], 0 ; and as calculated by Burke, Taylor, and Ormonde [1967] , solid curve.…”

Section: Threshold Datamentioning

confidence: 94%

Electron impact excitation of hydrogen Lyman-a radiation

Long¹,

Cox²,

Smith³

1968

J. RES. NATL. BUR. STAN. SECT. A.

105

View full text Add to dashboard Cite

show abstract

“…9 The results of Chamberlain, Smith, and Heddle are also normalized to theory near threshold in the manner given by Burke, Taylor, and Ormonde. 4 The sharp rise in the excitation cross section at threshold has been predicted by Damburg and Gailitis 2 from a close-coupling approximation calculation which includes the lowest three states of the H atom, i.e., the Is, 2s, and 2p states. Subsequent three-state close-coupling calculations by Taylor and Burke, 3 shown as TB (3state) in Fig.…”

mentioning

confidence: 77%

“…1(a), we give a comparison of our data with the earlier low-resolution experimental results of Chamberlain, Smith, and Heddle 5 and with two calculations on this system, both by Taylor and Burke. 4 In Fig. 1(b), the results of Taylor and Burke are shown as modified by folding into their correlation calculation our experimental electron energy distribution.…”

mentioning

confidence: 99%

H(2p)Excitation Resonances in (e−H) System Near Threshold

McGowan

Williams

1968

Phys. Rev. Lett.

View full text Add to dashboard Cite

show abstract

“…The R-matrix at r = a is determined from the E k , a ijk and the u ij 0 (r = a). The form of the wave function in the external region reduces to a close-coupling expansion without exchange: [6] The link between the internal and external regions (and therefore with the R-matrix) is provided by the requirement that the wave function and its derivative with respect to r must both be continuous at r = a. There are three features of the R-matrix method that have made it the method of choice for many researchers in electron-atom/molecule collisions.…”

Section: Back To England 1962-1967mentioning

confidence: 99%

Philip George Burke. 18 October 1932—4 June 2019

Hibbert

2021

Biogr. Mems Fell. R. Soc.

View full text Add to dashboard Cite

The development of theoretical and computational atomic and molecular physics in the second half of the twentieth century owes a great deal to Phil Burke. His knowledge and insight, his enthusiasm and encouragement, his vision and determination were essential characteristics for the success of his work and that of many others. He developed and used the R-matrix method in the study of the interaction between, on the one hand, atoms and molecules and their ions and, on the other, light or electrons. He published many original research papers and was author or editor of a number of books. Especially significant and far-reaching was his setting up of the journal Computer Physics Communications to enable an international field of scientists, initially to share computer codes, but subsequently also to discuss and develop methods in computational physics. While based at the Daresbury Laboratory, he established a number of Collaborative Computational Projects, thus providing a forum for scientists working in specific scientific disciplines to meet periodically to discuss current issues and in particular how the ever advancing cutting-edge of high-end computing could begin to address previously intractable problems. A consequence was his clarity of thinking about which new computer architectures were needed to make significant advances in each field of study, expertly guiding the UK's provision of high-end computers to academia for over 20 years. He was a clear and methodical teacher, at both graduate and undergraduate level, and was generous with the time he gave to his students. In short, he demonstrated a balanced level of excellence in all aspects of his career. He was a consummate academic and a fine role model for his colleagues.

show abstract

Low-energy electron scattering by atomic hydrogen: III. Comparison of theory and experiment for the electron-induced excitation of hydrogen to then= 2 level

Cited by 49 publications

References 10 publications

Electron impact excitation of hydrogen Lyman-a radiation

Electron impact excitation of hydrogen Lyman-a radiation

H(2p)Excitation Resonances in (e−H) System Near Threshold

Philip George Burke. 18 October 1932—4 June 2019

Contact Info

Product

Resources

About