Book contents
- Frontmatter
- Contents
- Preface
- Part One Content description
- A Aluminum Al to Arsenic As
- B Barium Ba to Boron B
- C Cadmium Cd to Curium Cm
- D Dysprosium Dy
- E Erbium Er to Europium Eu
- F Fluorine F
- G Gadolinium Gd to Gold Au
- H Hafnium Hf to Hydrogen H
- I Indium In to Iron Fe
- K Krypton Kr
- L Lanthanum La to Lutetium Lu
- M Magnesium Mg to Molybdenum Mo
- N Neodymium Nd to Nitrogen N
- O Osmium Os to Oxygen O
- P Palladium Pd to Promethium Pm
- R Rhenium Re to Ruthenium Ru
- S Samarium Sm to Sulfur S
- T Tantalum Ta to Tungsten W
- U Uranium U
- V Vanadium V
- X Xenon Xe
- Y Ytterbium Yb to Yttrium Y
- Z Zinc Zn to Zirconium Zr
- Summary
- Part Two Content description
- Part Three Content description
- Part Four Content description
- References
- Index of elements in stars
- Index of molecules in stars
K - Krypton Kr
Published online by Cambridge University Press: 06 July 2010
- Frontmatter
- Contents
- Preface
- Part One Content description
- A Aluminum Al to Arsenic As
- B Barium Ba to Boron B
- C Cadmium Cd to Curium Cm
- D Dysprosium Dy
- E Erbium Er to Europium Eu
- F Fluorine F
- G Gadolinium Gd to Gold Au
- H Hafnium Hf to Hydrogen H
- I Indium In to Iron Fe
- K Krypton Kr
- L Lanthanum La to Lutetium Lu
- M Magnesium Mg to Molybdenum Mo
- N Neodymium Nd to Nitrogen N
- O Osmium Os to Oxygen O
- P Palladium Pd to Promethium Pm
- R Rhenium Re to Ruthenium Ru
- S Samarium Sm to Sulfur S
- T Tantalum Ta to Tungsten W
- U Uranium U
- V Vanadium V
- X Xenon Xe
- Y Ytterbium Yb to Yttrium Y
- Z Zinc Zn to Zirconium Zr
- Summary
- Part Two Content description
- Part Three Content description
- Part Four Content description
- References
- Index of elements in stars
- Index of molecules in stars
Summary
This element was discovered by W. Ramsay and M. W. Travers in 1898 in London. Its name comes from the Greek kryptos (hidden).
lonization energies
KrI 14.0 eV, KrII 24.4 eV, KrIII 36.9 eV.
Absorption lines of KrI
No Kr line is seen in the solar spectrum.
Absorption lines of KrII
Following Bidelman's (1960) discovery of KrII in 3 Cen A, this element was observed in some other hot Bp stars. W(4355)=0.025 according to Hardorp (1966).
Emission lines of KrIII
Lines of [KrIII] are seen in the spectrum of at least one recurrent nova (Joy and Swings 1945).
Isotopes
Kr occurs in the form of six stable isotopes and 17 short-lived isotopes and isomers. The stable isotopes are Kr 78, 80, 82, 83, 84 and 86. In the solar system they represent 0.3%, 2%, 12%, 11%, 57% and 17% abundances respectively. Among the unstable isotopes, Kr81 has a half life of 2x 105 years.
Origin
Kr 83, 84 and 86 can be produced by both the r and the s process, Kr82 is a pure s process product, Kr78 a pure p product and Kr80 can be produced by either the s or the p process.
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- Publisher: Cambridge University PressPrint publication year: 1995