Mercury dimer
- Formula: Hg2
- Molecular weight: 401.18
- CAS Registry Number: 12596-25-7
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Constants of diatomic molecules
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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 compiled by: Klaus P. Huber and Gerhard H. Herzberg
Data collected through January, 1975
| Symbol | Meaning |
|---|---|
| State | electronic state and / or symmetry symbol |
| Te | minimum electronic energy (cm-1) |
| ωe | vibrational constant – first term (cm-1) |
| ωexe | vibrational constant – second term (cm-1) |
| ωeye | vibrational constant – third term (cm-1) |
| Be | rotational constant in equilibrium position (cm-1) |
| αe | rotational constant – first term (cm-1) |
| γe | rotation-vibration interaction constant (cm-1) |
| De | centrifugal distortion constant (cm-1) |
| βe | rotational constant – first term, centrifugal force (cm-1) |
| re | internuclear distance (Å) |
| Trans. | observed transition(s) corresponding to electronic state |
| ν00 | position of 0-0 band (units noted in table) |
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| emission 2 | Numerous bands and continua in absorption and emission from 19000 to 71000 cm-1. Literature before 1938 reviewd in Finkelnburg, 1938; details concerning the 2540 Å (39353 cm-1) band in Mrozowski, 1949. 1 - See also HgO. | |||||||||||
| ↳Finkelnburg, 1938; Mrozowski, 1949 | ||||||||||||
| emission 2 | 22152 | |||||||||||
| ↳Takeyama, 1952 | ||||||||||||
| emission 3 | 19615 | |||||||||||
| ↳Takeyama, 1952 | ||||||||||||
| 1Σg+ | 0 | (36) | (3.3) | |||||||||
| ↳Kuhn and Freudenberg, 1932; missing citation; Kuhn, 1937; Epstein and Powers, 1953 | ||||||||||||
Notes
| 1 | For radiative lifetimes of the upper states of the 3350 Å (29840 cm-1) and 4850 Å (20610 cm-1) emissions see ( Ladd, Freeman, et al., 1973, Phaneuf, Skonieczny, et al., 1973, Skonieczny and Krause, 1974). |
| 2 | Large number of additional emission features reported by Takeyama, 1952 whose tentative vibrational assignments in the regions 21000 - 22800 and 18800 - 20100 cm-1 suggest ωe'=122, ωe"xe" = 0.6; ωe"=145, ωe"xe" = 0.5 |
| 3 | ωe'=121; ωe"=141, ωe"xe" = 0.5 |
| 4 | Thermochemical value Koernicke, 1925, Kuhn and Freudenberg, 1932, Kuhn, 1937, disregarding corrections for rotation suggested by Winans and Heitz, 1952 which in our view do not apply. |
| 5 | From Arnot and M'Ewen, 1938. |
References
Go To: Top, Constants of diatomic molecules, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Finkelnburg, 1938
Finkelnburg, W.,
Kontinuierliche spektren, Pub. Springer, Berlin, 1938, 0. [all data]
Mrozowski, 1949
Mrozowski, S.,
Structure of the mercury bands λ2540 and λ2476,
Phys. Rev., 1949, 76, 1714. [all data]
Takeyama, 1952
Takeyama, H.,
On the molecular spectra emitted by mercury vapor,
J. Sci. Hiroshima Univ. Ser. A: Math. Phys. Chem., 1952, 15, 235-268. [all data]
Kuhn and Freudenberg, 1932
Kuhn, H.; Freudenberg, K.,
Uber das absorptionsspektrum des quecksilberdampfes,
Z. Phys., 1932, 76, 38. [all data]
Kuhn, 1937
Kuhn, H.,
Pressure broadening of spectral lines and van der Waals forces. II. Continuous broadening and discrete bands in pure mercury vapour,
Proc. R. Soc. London A, 1937, 158, 230. [all data]
Epstein and Powers, 1953
Epstein, L.F.; Powers, M.D.,
Liquid metals. I. The viscosity of mercury vapor and the potential function for mercury,
J. Phys. Chem., 1953, 57, 336. [all data]
Ladd, Freeman, et al., 1973
Ladd, A.G.; Freeman, C.G.; McEwan, M.J.; Claridge, R.F.C.; Phillips, L.F.,
Phase-shift studies of Hg(3P0) reactions. Part 4. Observations of the Hg2 emission bands at 335 and 485 nm,
J. Chem. Soc. Faraday Trans. 2, 1973, 69, 849. [all data]
Phaneuf, Skonieczny, et al., 1973
Phaneuf, R.A.; Skonieczny, J.; Krause, L.,
Formation and decay of excited Hg2 molecules in Hg-N2 mixtures,
Phys. Rev. A: Gen. Phys., 1973, 8, 2980. [all data]
Skonieczny and Krause, 1974
Skonieczny, J.; Krause, L.,
Effect of Hg2-Hg collisions on the formation and decay of excited Hg2 molecules in Hg-N2 mixtures,
Phys. Rev. A: Gen. Phys., 1974, 9, 1612. [all data]
Koernicke, 1925
Koernicke, E.,
Bestimmung der dissoziationswarme von quecksilbermolekulen aus den bandenspektren des quecksilberdampfes,
Z. Phys., 1925, 33, 219. [all data]
Winans and Heitz, 1952
Winans, J.G.; Heitz, M.P.,
The energie of dissociation of Hg2,
Z. Phys., 1952, 133, 291. [all data]
Arnot and M'Ewen, 1938
Arnot, F.L.; M'Ewen, M.B.,
The formation of mercury molecules. II,
Proc. R. Soc. London A, 1938, 165, 133. [all data]
Notes
Go To: Top, Constants of diatomic molecules, References
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