Ramsauer–Townsendn.

Brit.

/ˌramzaʊəˈtaʊnzɛnd/, U.S.

/ˌræmzaʊərˈtoʊnzˌɛnd/

Origin: From proper names . Etymons: proper names Ramsauer, Townsend.

Etymology: < the names of Carl Wilhelm Ramsauer (see Ramsauer n.) and John Sealy Edward Townsend (1868–1957), Irish physicist, who (with V. A. Bailey) independently described the Ramsauer effect in 1922 ( Philos. Mag. 43 593). Compare earlier Ramsauer effect n. at Ramsauer n. 1a and later Ramsauer minimum n. at Ramsauer n. 1b.

Physics.

1. Ramsauer–Townsend effect n. = Ramsauer effect n. at Ramsauer n. 1a.

ΘΚΠ

the world > matter > physics > atomic physics > particle physics > action of dispersing particles > [noun] > scattering or energy relationship

Compton effect1924

Ramsauer effect1926

Ramsauer–Townsend effect1952

1952 H. S. W. Massey & E. H. S. Burhop Electronic & Ionic Impact Phenomena i. 9 The remarkable transparency of the heavier rare gases atoms towards electrons of energy 1 eV or so..will be referred to as the Ramsauer–Townsend effect.

1975 Radiation Res. 63 29 Secondary electrons have appreciable energies even at 100 Torr of He, and are hardly moderated in Ar, Kr, and Xe..owing to the Ramsauer–Townsend effect.

1996 Physical Rev. A. 54 2888 The Ramsauer–Townsend effect affects significantly the values of the cross sections, especially for the inelastic transitions with large energy transfer.

2. Ramsauer–Townsend minimum n. = Ramsauer minimum n. at Ramsauer n. 1b.

ΘΚΠ

the world > matter > physics > atomic physics > particle physics > action of dispersing particles > [noun] > scattering or energy relationship > minimum

Ramsauer–Townsend minimum1952

Ramsauer minimum1960

1952 H. S. W. Massey & E. H. S. Burhop Electronic & Ionic Impact Phenomena iii. 115 It is now of interest to consider the contribution from higher-order cross-sections. These are very small at the Ramsauer–Townsend minimum.

1963 Physical Rev. 130 1022/2 It might be guessed that the Ramsauer–Townsend minimum should occur at approximately the same place in both scattering and momentum transfer cross sections.

1995 Jrnl. Chem. Physics 102 6552 Ar has a conspicuous Ramsauer–Townsend minimum.

This entry has been updated (OED Third Edition, June 2008; most recently modified version published online March 2022).

单词	ramsauer–townsend
释义	Ramsauer–Townsendn. Brit. /ˌramzaʊəˈtaʊnzɛnd/, U.S. /ˌræmzaʊərˈtoʊnzˌɛnd/ Origin: From proper names . Etymons: proper names Ramsauer, Townsend. Etymology: < the names of Carl Wilhelm Ramsauer (see Ramsauer n.) and John Sealy Edward Townsend (1868–1957), Irish physicist, who (with V. A. Bailey) independently described the Ramsauer effect in 1922 ( Philos. Mag. 43 593). Compare earlier Ramsauer effect n. at Ramsauer n. 1a and later Ramsauer minimum n. at Ramsauer n. 1b. Physics. 1. Ramsauer–Townsend effect n. = Ramsauer effect n. at Ramsauer n. 1a. ΘΚΠ the world > matter > physics > atomic physics > particle physics > action of dispersing particles > [noun] > scattering or energy relationship Compton effect1924 Ramsauer effect1926 Ramsauer–Townsend effect1952 1952 H. S. W. Massey & E. H. S. Burhop Electronic & Ionic Impact Phenomena i. 9 The remarkable transparency of the heavier rare gases atoms towards electrons of energy 1 eV or so..will be referred to as the Ramsauer–Townsend effect. 1975 Radiation Res. 63 29 Secondary electrons have appreciable energies even at 100 Torr of He, and are hardly moderated in Ar, Kr, and Xe..owing to the Ramsauer–Townsend effect. 1996 Physical Rev. A. 54 2888 The Ramsauer–Townsend effect affects significantly the values of the cross sections, especially for the inelastic transitions with large energy transfer. 2. Ramsauer–Townsend minimum n. = Ramsauer minimum n. at Ramsauer n. 1b. ΘΚΠ the world > matter > physics > atomic physics > particle physics > action of dispersing particles > [noun] > scattering or energy relationship > minimum Ramsauer–Townsend minimum1952 Ramsauer minimum1960 1952 H. S. W. Massey & E. H. S. Burhop Electronic & Ionic Impact Phenomena iii. 115 It is now of interest to consider the contribution from higher-order cross-sections. These are very small at the Ramsauer–Townsend minimum. 1963 Physical Rev. 130 1022/2 It might be guessed that the Ramsauer–Townsend minimum should occur at approximately the same place in both scattering and momentum transfer cross sections. 1995 Jrnl. Chem. Physics 102 6552 Ar has a conspicuous Ramsauer–Townsend minimum. This entry has been updated (OED Third Edition, June 2008; most recently modified version published online March 2022). < n.1952
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