Paschenn.

Brit.

/ˈpaʃn/, U.S.

/ˈpæʃ(ə)n/

Origin: From a proper name. Etymon: proper name Paschen.

Etymology: < the name of Louis Carl Heinrich Friedrich Paschen (1865–1947), German physicist, who discovered the phenomena.

a. Paschen's law n. (also Paschen law) a law relating to gas discharges formulated by Paschen in 1889 ( Ann. der Physik u. Chem. 37 90) which states that at a constant temperature the breakdown voltage in any particular gas depends only on the product of the pressure and the interelectrode distance.

ΘΚΠ

the world > matter > chemistry > physical chemistry > gaseous phase > [noun] > gas laws

Gay-Lussac's law1827

Boyle's law1839

Mariotte's law1843

Gay-Lussac's law1844

Graham's law1845

Henry's law1848

Avogadro's law1880

Charles's law1884

Paschen's law1903

1903 Proc. Royal Soc. 1902–3 71 375 A general application of Paschen's law demands that the minimum spark potential must be a physical constant for each gas.

1947 Science 12 Sept. 234 The famous Paschen law that the sparking potential is a function of the product of pressure and gap length.

1968 G. F. Weston Cold Cathode Glow Discharge Tubes ii. 59 For the case of a non-uniform field Paschen's law relating breakdown to gap width and pressure no longer holds.

1973 Philos. Trans. (Royal Soc.) A. 275 237 Both mercury valve and thyristor are limited in voltage withstand of an individual element—in the plasma device by ‘vacuum’ breakdown and by the consequences of Paschen's Law.

2002 IEEE Trans. Dielectrics & Electr. Insulation 9 680/2 In the early 1970s, deviations from Paschen's law for high pressure SF₆ were reported.

b. Paschen curve n. (also Paschen's curve) a graph of the breakdown voltage in a gas against the product of pressure and interelectrode distance.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > electricity > voltage > [noun] > higher than usual voltage > graph of breakdown voltage

Paschen curve1957

1957 A. F. Monypenny tr. F. M. Penning Electr. Discharges in Gases vi. 32 (caption) Paschen curves for breakdown between flat iron plates in various gases and gas mixtures.

1967 IEEE Trans. Electr. Insulation 2 82/1 In accordance with Paschen's curve, equally large discharge voltages could also result for very small voids.

2002 IEEE Trans. Dielectrics & Electr. Insulation 9 674/2 Paschen curve measurements refer to breakdown voltage measurements in a uniform field.

2. Physics and Astronomy Paschen series n. a series of lines in the infrared part of the spectrum of atomic hydrogen, with wave numbers represented by R(1/3² − 1/m²) (where R is the Rydberg constant and m = 4, 5,…), of which the first line has a wavelength of 1875 nanometres and the series limit is at 820 nanometres. Paschen line n. a spectral line of this series.

ΚΠ

1912 Proc. Royal Soc. A. 87 264 In the table of lines given by Paschen for these series m = 5.5 is the highest member he cites for the second subordinate series.]

1922 Encycl. Brit. XXXII. 559/2 The formulæ for the hydrogen series are as follows:—Lyman series: ν = N/1² − N/m² (m = 2, 3,..). Balmer series: ν = N/2² − N/m² (m = 3, 4,..). Paschen series: ν = N/3² − N/m² (m = 4, 5,..).

1927 Proc. Royal Soc. A. 116 101 The absolute intensities and decay-constants of all the components of the Lyman, Balmer and Paschen lines have been calculated.

1967 W. R. Hindmarsh Atomic Spectra ii. 13 Ritz..proposed his well-known combination principle in 1908... It was with the use of this principle that the Paschen, Lyman, Brackett and Pfund series in the spectrum of hydrogen were predicted.

1984 D. C. Giancoli Gen. Physics xl. 788 n′=1 corresponds to the Lyman series and n′=3 to the Paschen series.

1999 Proc. National Acad. Sci. U.S.A. 96 5367/1 The interstellar extinction factor, C, can be found..from a comparison of Paschen and Balmer lines arising from the same n.

This entry has been updated (OED Third Edition, June 2005; most recently modified version published online March 2022).

单词	paschen
释义	Paschenn. Brit. /ˈpaʃn/, U.S. /ˈpæʃ(ə)n/ Origin: From a proper name. Etymon: proper name Paschen. Etymology: < the name of Louis Carl Heinrich Friedrich Paschen (1865–1947), German physicist, who discovered the phenomena. 1. a. Paschen's law n. (also Paschen law) a law relating to gas discharges formulated by Paschen in 1889 ( Ann. der Physik u. Chem. 37 90) which states that at a constant temperature the breakdown voltage in any particular gas depends only on the product of the pressure and the interelectrode distance. ΘΚΠ the world > matter > chemistry > physical chemistry > gaseous phase > [noun] > gas laws Gay-Lussac's law1827 Boyle's law1839 Mariotte's law1843 Gay-Lussac's law1844 Graham's law1845 Henry's law1848 Avogadro's law1880 Charles's law1884 Paschen's law1903 1903 Proc. Royal Soc. 1902–3 71 375 A general application of Paschen's law demands that the minimum spark potential must be a physical constant for each gas. 1947 Science 12 Sept. 234 The famous Paschen law that the sparking potential is a function of the product of pressure and gap length. 1968 G. F. Weston Cold Cathode Glow Discharge Tubes ii. 59 For the case of a non-uniform field Paschen's law relating breakdown to gap width and pressure no longer holds. 1973 Philos. Trans. (Royal Soc.) A. 275 237 Both mercury valve and thyristor are limited in voltage withstand of an individual element—in the plasma device by ‘vacuum’ breakdown and by the consequences of Paschen's Law. 2002 IEEE Trans. Dielectrics & Electr. Insulation 9 680/2 In the early 1970s, deviations from Paschen's law for high pressure SF₆ were reported. b. Paschen curve n. (also Paschen's curve) a graph of the breakdown voltage in a gas against the product of pressure and interelectrode distance. ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > voltage > [noun] > higher than usual voltage > graph of breakdown voltage Paschen curve1957 1957 A. F. Monypenny tr. F. M. Penning Electr. Discharges in Gases vi. 32 (caption) Paschen curves for breakdown between flat iron plates in various gases and gas mixtures. 1967 IEEE Trans. Electr. Insulation 2 82/1 In accordance with Paschen's curve, equally large discharge voltages could also result for very small voids. 2002 IEEE Trans. Dielectrics & Electr. Insulation 9 674/2 Paschen curve measurements refer to breakdown voltage measurements in a uniform field. 2. Physics and Astronomy Paschen series n. a series of lines in the infrared part of the spectrum of atomic hydrogen, with wave numbers represented by R(1/3² − 1/m²) (where R is the Rydberg constant and m = 4, 5,…), of which the first line has a wavelength of 1875 nanometres and the series limit is at 820 nanometres. Paschen line n. a spectral line of this series. ΚΠ 1912 Proc. Royal Soc. A. 87 264 In the table of lines given by Paschen for these series m = 5.5 is the highest member he cites for the second subordinate series.] 1922 Encycl. Brit. XXXII. 559/2 The formulæ for the hydrogen series are as follows:—Lyman series: ν = N/1² − N/m² (m = 2, 3,..). Balmer series: ν = N/2² − N/m² (m = 3, 4,..). Paschen series: ν = N/3² − N/m² (m = 4, 5,..). 1927 Proc. Royal Soc. A. 116 101 The absolute intensities and decay-constants of all the components of the Lyman, Balmer and Paschen lines have been calculated. 1967 W. R. Hindmarsh Atomic Spectra ii. 13 Ritz..proposed his well-known combination principle in 1908... It was with the use of this principle that the Paschen, Lyman, Brackett and Pfund series in the spectrum of hydrogen were predicted. 1984 D. C. Giancoli Gen. Physics xl. 788 n′=1 corresponds to the Lyman series and n′=3 to the Paschen series. 1999 Proc. National Acad. Sci. U.S.A. 96 5367/1 The interstellar extinction factor, C, can be found..from a comparison of Paschen and Balmer lines arising from the same n. This entry has been updated (OED Third Edition, June 2005; most recently modified version published online March 2022). < n.1903
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