Methyl radical

• Formula: CH₃
• Molecular weight: 15.0345
• IUPAC Standard InChI: InChI=1S/CH3/h1H3 Copy

  
• IUPAC Standard InChIKey: WCYWZMWISLQXQU-UHFFFAOYSA-N Copy
• CAS Registry Number: 2229-07-4
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
  The 3d structure may be viewed using Java or Javascript.
• Isotopologues:
  • Methyl-d3 radical
  • Methyl-d3 radical
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Gas phase thermochemistry data
  • Gas phase ion energetics data
  • Ion clustering data
  • Vibrational and/or electronic energy levels
  • References
  • Notes
• Other data available:
  • Reaction thermochemistry data
• Data at other public NIST sites:
  • Electron-Impact Ionization Cross Sections (on physics web site)
  • Gas Phase Kinetics Database
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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 (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/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:
B - John E. Bartmess
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

View reactions leading to CH₃⁺ (ion structure unspecified)

Electron affinity determinations

Ionization energy determinations

Appearance energy determinations

Cation De-protonation reactions

CH₂^- +  =

By formula: CH₂^- + H⁺ = CH₃⁺

Ion clustering data

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Vibrational and/or electronic energy levels, References, Notes

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

Data compiled by: Robert C. Dunbar

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.

Clustering reactions

 +  = ( • )

By formula: Co⁺ + CH₃ = (Co⁺ • CH₃)

 +  = ( • )

By formula: Cr⁺ + CH₃ = (Cr⁺ • CH₃)

 +  = ( • )

By formula: Cu⁺ + CH₃ = (Cu⁺ • CH₃)

 +  = ( • )

By formula: Fe⁺ + CH₃ = (Fe⁺ • CH₃)

 +  = ( • )

By formula: La⁺ + CH₃ = (La⁺ • CH₃)

 +  = ( • )

By formula: Lu⁺ + CH₃ = (Lu⁺ • CH₃)

 +  = ( • )

By formula: Mn⁺ + CH₃ = (Mn⁺ • CH₃)

 +  = ( • )

By formula: Ni⁺ + CH₃ = (Ni⁺ • CH₃)

 +  = ( • )

By formula: Si⁺ + CH₃ = (Si⁺ • CH₃)

( • ) +  = ( • 2)

By formula: (Si⁺ • CH₃) + CH₃ = (Si⁺ • 2CH₃)

( • 2) +  = ( • 3)

By formula: (Si⁺ • 2CH₃) + CH₃ = (Si⁺ • 3CH₃)

( • 3) +  = ( • 4)

By formula: (Si⁺ • 3CH₃) + CH₃ = (Si⁺ • 4CH₃)

 +  = ( • )

By formula: Y⁺ + CH₃ = (Y⁺ • CH₃)

Vibrational and/or electronic energy levels

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Ion clustering data, References, Notes

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

Data compiled by: Marilyn E. Jacox

State:   4f ²E'?

State:   4p ²A₂

State:   3d ²A₁'

State:   3d ²E

State:   3p ²A₂

State:   3s ²A₁'

State:   X

Additional references: Jacox, 1994, page 125; Jacox, 1998, page 214; Jacox, 2003, page 156; Frye, Sears, et al., 1988; Parker, Wang, et al., 1989; Sears, Frye, et al., 1989; Westre and Kelly, 1989; Miller, Burton, et al., 1989; Fawzy, Sears, et al., 1990; Rudolph, Hall, et al., 1996

Notes

References

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Ion clustering data, Vibrational and/or electronic energy levels, Notes

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

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Georgiadis, R.; Armentrout, P.B., Translational and Electronic Energy Dependence of the Reaction of Mn+ with Ethane, Int. J. Mass Spectrom. Ion Proc., 1989, 91, 2, 123, https://doi.org/10.1016/0168-1176(89)83003-4 . [all data]

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Herzberg, G., The Bakerian Lecture. The Spectra and Structures of Free Methyl and Free Methylene, Proc. Roy. Soc. (London) A262, 1961, 262, 1310, 291, https://doi.org/10.1098/rspa.1961.0120 . [all data]

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Zhang, B.; Zhang, J.; Liu, K., Imaging the "missing" bands in the resonance-enhanced multiphoton ionization detection of methyl radical, J. Chem. Phys., 2005, 122, 10, 104310, https://doi.org/10.1063/1.1859277 . [all data]

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Jacox, 1998
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Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement B, J. Phys. Chem. Ref. Data, 2003, 32, 1, 1-441, https://doi.org/10.1063/1.1497629 . [all data]

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Parker, Wang, et al., 1989
Parker, D.H.; Wang, Z.W.; Janssen, M.H.M.; Chandler, D.W., Laser ionization spectroscopy of CD3 via the 3pz 2A'2 Rydberg state, J. Chem. Phys., 1989, 90, 1, 60, https://doi.org/10.1063/1.456466 . [all data]

Sears, Frye, et al., 1989
Sears, T.J.; Frye, J.M.; Spirko, V.; Kraemer, W.P., Extended measurements of the ν2 band of CD3 and the determination of the vibrational potential function for methyl, J. Chem. Phys., 1989, 90, 4, 2125, https://doi.org/10.1063/1.456006 . [all data]

Westre and Kelly, 1989
Westre, S.G.; Kelly, P.B., Examination of CD3 vibrational structure by resonance Raman spectroscopy, J. Chem. Phys., 1989, 90, 12, 6977, https://doi.org/10.1063/1.456273 . [all data]

Miller, Burton, et al., 1989
Miller, J.T.; Burton, K.A.; Weisman, R.B.; Wu, W.-X.; Engel, P.S., Cars spectroscopy of gas phase CD3, Chem. Phys. Lett., 1989, 158, 3-4, 179, https://doi.org/10.1016/0009-2614(89)87317-8 . [all data]

Fawzy, Sears, et al., 1990
Fawzy, W.M.; Sears, T.J.; Davies, P.B., Infrared diode laser spectroscopy of the ν3 fundamental of the CD3 radical, J. Chem. Phys., 1990, 92, 12, 7021, https://doi.org/10.1063/1.458242 . [all data]

Rudolph, Hall, et al., 1996
Rudolph, R.N.; Hall, G.E.; Sears, T.J., Measurement of the ν3 fundamental transition moment and vibrational relaxation rates of the CD3 radical, J. Chem. Phys., 1996, 105, 18, 7889, https://doi.org/10.1063/1.472704 . [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Ion clustering data, Vibrational and/or electronic energy levels, References

• Symbols used in this document:
  

  AE	Appearance energy
  EA	Electron affinity
  IE (evaluated)	Recommended ionization energy
  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  ΔfH(+) ion,0K	Enthalpy of formation of positive ion at 0K
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔrG°	Free energy of reaction at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions

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