strontium

• Formula: Sr
• Molecular weight: 87.62
• IUPAC Standard InChI: InChI=1S/Sr Copy

  
• IUPAC Standard InChIKey: CIOAGBVUUVVLOB-UHFFFAOYSA-N Copy
• CAS Registry Number: 7440-24-6
• Chemical structure:
  This structure is also available as a 2d Mol file
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• Information on this page:
  • Gas phase thermochemistry data
  • Gas phase ion energetics data
  • References
  • Notes
• Other data available:
  • Condensed phase thermochemistry data
• Data at other public NIST sites:
  • NIST Atomic Spectra Database - Lines Holdings (on physics web site)
  • NIST Atomic Spectra Database - Levels Holdings (on physics web site)
  • NIST Atomic Spectra Database - Ground states and ionization energies (on physics web site)
  • Gas Phase Kinetics Database
  • X-ray Photoelectron Spectroscopy Database, version 5.0
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• NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data)

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Gas phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Gas Phase Heat Capacity (Shomate Equation)

C_p° = A + B*t + C*t² + D*t³ + E/t²
H° − H°_298.15= A*t + B*t²/2 + C*t³/3 + D*t⁴/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t²/2 + D*t³/3 − E/(2*t²) + G
    C_p = heat capacity (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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Gas phase ion energetics data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data evaluated as indicated in comments:
L - Sharon G. Lias

Data compiled as indicated in comments:
LL - Sharon G. Lias and Joel F. Liebman
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess

View reactions leading to Sr⁺ (ion structure unspecified)

Electron affinity determinations

Ionization energy determinations

References

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Andersen, Petrunin, et al., 1997
Andersen, H.H.; Petrunin, V.V.; Kristensen, P.; Andersen, T., Structural properties of the negative strontium ion: Binding energy and fine-structure splitting, Phys. Rev. A, 1997, 55, 4, 3247-3249, https://doi.org/10.1103/PhysRevA.55.3247 . [all data]

Berkovits, Boaretto, et al., 1995
Berkovits, D.; Boaretto, E.; Ghelberg, S.; Heber, O.; Paul, M., Electron affinity of strontium, Phys. Rev. Lett., 1995, 75, 3, 414, https://doi.org/10.1103/PhysRevLett.75.414 . [all data]

Lide, 1992
Lide, D.R. (Editor), Ionization potentials of atoms and atomic ions in Handbook of Chem. and Phys., 1992, 10-211. [all data]

Asano and Kou, 1988
Asano, M.; Kou, T., Thermochemical properties of SrBO₂(g) and SrB₂O₄(s), J. Chem. Thermodyn., 1988, 20, 1149. [all data]

Kleinschmidt and Hildenbrand, 1978
Kleinschmidt, P.D.; Hildenbrand, D.L., Dissociation energies of CaI, SrI, and BaI from high temperature mass spectrometry, J. Chem. Phys., 1978, 68, 2819. [all data]

Hildenbrand, 1977
Hildenbrand, D.L., Dissociation energies of CaBr, SrBr, BaBr, and BaCl from mass spectrometric studies of gaseous equilibria, J. Chem. Phys., 1977, 66, 3526. [all data]

Okudaira, 1970
Okudaira, S., Multiple ionization of Ca, Sr and Ba by electron impact, J. Phys. Soc. Jpn., 1970, 29, 409. [all data]

Moore, 1970
Moore, C.E., Ionization potentials and ionization limits derived from the analyses of optical spectra, Natl. Stand. Ref. Data Ser., (U.S. Natl. Bur. Stand.), 1970, 34, 1. [all data]

Notes

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• Symbols used in this document:
  

  EA	Electron affinity
  IE (evaluated)	Recommended ionization energy
  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  ΔfH°gas	Enthalpy of formation of gas at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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