HCs
- Formula: CsH
- Molecular weight: 133.91339
- CAS Registry Number: 13772-47-9
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Reaction thermochemistry data
Go To: Top, Gas phase ion energetics data, Constants of diatomic molecules, 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: John E. Bartmess
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Individual Reactions
Cs- + = HCs
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 1441.765 ± 0.042 | kJ/mol | D-EA | Scheer, Tho/gersen, et al., 1998 | gas phase; Given: 0.47164(6) eV |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrG° | 1422.7 ± 0.46 | kJ/mol | H-TS | Scheer, Tho/gersen, et al., 1998 | gas phase; Given: 0.47164(6) eV |
Gas phase ion energetics data
Go To: Top, Reaction thermochemistry data, Constants of diatomic molecules, 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: John E. Bartmess
De-protonation reactions
Cs- + = HCs
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 1441.765 ± 0.042 | kJ/mol | D-EA | Scheer, Tho/gersen, et al., 1998 | gas phase; Given: 0.47164(6) eV |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrG° | 1422.7 ± 0.46 | kJ/mol | H-TS | Scheer, Tho/gersen, et al., 1998 | gas phase; Given: 0.47164(6) eV |
Constants of diatomic molecules
Go To: Top, Reaction thermochemistry data, Gas phase ion energetics 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: Klaus P. Huber and Gerhard H. Herzberg
Data collected through November, 1976
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| a (3Δ) | [28534] 1 | [276] 1 | [1.51] 1 | |||||||||
| ↳Ringstrom, 1970 | ||||||||||||
| B 1Σ+ | [28350.5] 2 | [82.1] 2 Z | [0.070] 2 | [4.63] | B ← X R | 27908.2 2 Z | ||||||
| ↳Ringstrom, 1970 | ||||||||||||
| A 1Σ+ | 17845.8 | 165.7 Z | -7.77 3 | 1.075 | -0.0219 4 | 0.000098 | -2.0E-06 | 3.960 | A ↔ X R | 17488.3 Z | ||
| ↳Almy and Rassweiler, 1938; Bartky, 1966; Tam and Happer, 1976 | ||||||||||||
| X 1Σ+ | 0 | 891.0 Z | 12.93 5 | 0.105 | 2.7099 | 0.0579 | [113] | 2.4938 | ||||
Notes
| 1 | Constants for the lowest of three levels observed in small perturbations of B 1Σ+; A~14. Vibrational numbering unknown, Ω = 3 not observed. |
| 2 | Constants for the lowest of eleven observed levels, v'= 11 ± 3. ΔG increases to 93.7 for v=18; Bv(v ≤ 18) = 0.787 - 0.0076(v+1/2). For v > 18 both ΔG and Bv decrease rapidly. |
| 3 | ωexe= -0.297(v+1/2)3 + 0.0040(v+1/2)4 (valid for v ≤ 15). |
| 4 | αv= 0.00131(v+1/2)2; v ≤ 13. |
| 5 | ωeze = -0.0018. Observed up to v" =14 in laser-excited fluorescence Tam and Happer, 1976. |
| 6 | Short extrapolation of vibrational levels in B 1Σ+ to the limit 2D + 2S Ringstrom, 1970. A longer extrapolation of the ground state levels Tam and Happer, 1976 gives 2.08 eV. |
| 7 | From band heads, 8 ≤ v' ≤ 18. |
| 8 | Only the 10-0 and 11-0 bands have been rotationally analyzed Bartky, 1966; B10 = 0.587, B11 = 0.586. |
| 9 | Band origins for the 10-0 and 11-0 bands at 19091.2 and 19261.8 cm-1. |
References
Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, 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.
Scheer, Tho/gersen, et al., 1998
Scheer, M.; Tho/gersen, J.; Bilodeau, R.C.; Brodie, C.A.; Haugen, H.K.,
Experimental Evidence that the 6s6p2Pj States of Cs- are Shape Resonances,
Phys. Rev. Lett., 1998, 80, 4, 684, https://doi.org/10.1103/PhysRevLett.80.684
. [all data]
Ringstrom, 1970
Ringstrom, U.,
A new band system and Klein-Rydberg potential curves of CsH,
J. Mol. Spectrosc., 1970, 36, 232. [all data]
Almy and Rassweiler, 1938
Almy, G.M.; Rassweiler, M.,
The absorption spectrum of caesium hydride,
Phys. Rev., 1938, 53, 890. [all data]
Bartky, 1966
Bartky, I.R.,
The absorption spectrum of cesium deuteride. The A1Σ state of CsH,
J. Mol. Spectrosc., 1966, 21, 25. [all data]
Tam and Happer, 1976
Tam, A.C.; Happer, W.,
Spectroscopy of the CsH (X1Σ+) state by laser-excited fluorescence,
J. Chem. Phys., 1976, 64, 2456. [all data]
Notes
Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Constants of diatomic molecules, References
- Symbols used in this document:
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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