Low-energy electron scattering by atomic hydrogen: I. The close-coupling approximation

Burke, P G; Ormonde, Stephan; Whitaker, William A.

doi:10.1088/0370-1328/92/2/308

Cited by 153 publications

(23 citation statements)

References 48 publications

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“…The calculation which provides both position and width is a six-state close-coupling calculation by Burke et al (1967). Their results are higher than the present ones and outside the estimated error.…”

contrasting

confidence: 47%

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Nonarchimedean Uniformization

Mustafin¹

1978

Math. USSR Sb.

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contrasting

confidence: 47%

“…In particular, we employ the technique used by Doolen (1975) Burke et al (1967). In the present calculation 125 terms (w = 9) are used.…”

mentioning

confidence: 99%

Nonarchimedean Uniformization

Mustafin¹

1978

Math. USSR Sb.

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“…We solve the partial redistribution (PRD) only for Ly (in the future we plan to include PRD in other lines as well). For the results shown here we used the ionization collisional rates of Mihalas (1967; see references therein for the original sources) and the collisional excitation rates of Burke et al (1967) and Sampson & Golden (1970), which are relatively large compared to other published ones. For estimating effects of collision rates uncertainties, we have also performed NLTE calculations using collisional excitation and ionization rates from Johnson (1972), with the following exception: for transitions between the lowest five levels we used the values of Aggarwal et al (1991).…”

Section: The H and H-nlte Calculationsmentioning

confidence: 99%

Semiempirical Models of the Solar Atmosphere. II. The Quiet‐Sun Low Chromosphere at Moderate Resolution

Fontenla

Balasubramaniam

Harder

2007

ApJ

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We present a new, one-dimensional model of the solar atmosphere (called SRPM 305) at moderate angular resolution ($1 00 Y2 00 ). Key characteristics of the SRPM 305 model include (1) a minimum temperature of $3800 K at a gas pressure of $80 dyne cm À2 and (2) a rapid temperature rise above the temperature-minimum layer that results in substantial overionization of most elements when compared with LTE calculations. The model calculations reproduce the $4300 K minimum brightness temperature of the UV continuum ( between 1400Y1500 8) observed by SUMER and the $4400 K observed minimum radio-continuum brightness temperature (between wavelengths 0.01 and 100 mm). Neither the UV nor the radio continuum bear on the low-temperature minimum value because their broad intensity contribution functions cause the higher temperatures of the upper chromospheric layers to effectively hide the low minimum temperature region. The SRPM 305 model reproduces the observed intensities of CO lines at 4.466 m, at both the disk center and near the limb, by using C and O abundances consistent with recent literature low values. The model also reproduces observed intensities of C i spectral lines at 5381 and 8337 8, CH lines at about 4306 8, the CN band head at 3883 8, and the O i lines at 7772, 7774, and 7776 8, respectively. Using the SRPM 305 model, we find no significant abundance variations between the photosphere and the low chromosphere. Consequently, the single-component model presented here matches several apparently contradictory observations and thereby resolves the controversy about the temperature minimum value.

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“…The 'close-coupling' approximation has been used to calculate cross sections for excitation of Mg + and Ca + (96), and cross sections for 2s 2^> -2s2p 3 P and l P in Cm and other ions (97). Some very elaborate calculations for e-H scattering (98) give the best estimates currently available for the near threshold excitation of the n= 2 levels. Similar calculations have been made for excitation of He + (99).…”

Section: Excitation Of Atoms and Ions By Electron Impactmentioning

confidence: 99%

Committee 3: Collision Cross Sections and Line Broadening

Seaton¹

1970

Trans. Int. Astron. Union

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Two review articles have been published (1,2).1.1.Collision broadening by neutral atoms.The continued study of widths and shifts produced by neutral atom impacts at low densities has shown that the Van der Waals interaction ( — C6r−6)as used, for example, in (3), is an inadequate representation of the interatomic potential. The classical theory for a Leonard-Jones potential(C12r−12— C6r−6)has been developed (4) and subjected to experimental test (5). Further improvements result from introducing a term C8r−8in the potential (6) and from allowance for quasi-static effects (7). Applications to broadening by H—atom impact are discussed in (8).

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Low-energy electron scattering by atomic hydrogen: I. The close-coupling approximation

Cited by 153 publications

References 48 publications

Nonarchimedean Uniformization

Nonarchimedean Uniformization

Semiempirical Models of the Solar Atmosphere. II. The Quiet‐Sun Low Chromosphere at Moderate Resolution

Committee 3: Collision Cross Sections and Line Broadening

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