Iodosilylidyne
- Formula: ISi
- Molecular weight: 154.9900
- IUPAC Standard InChI: InChI=1S/HISi/c1-2/h2H
- IUPAC Standard InChIKey: BEADMLIDEVGQBP-UHFFFAOYSA-N
- CAS Registry Number: 13841-19-5
- Chemical structure:
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Constants of diatomic molecules
Go To: Top, 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 September, 1977
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Unassigned bands in the region 41500 - 43600 cm-1. | ||||||||||||
| ↳Olddershaw and Robinson, 1972 | ||||||||||||
| F | F ← X1 V | 44995 H | ||||||||||
| ↳missing citation | ||||||||||||
| (E) 1 | (E ← X) | (44104) | ||||||||||
| ↳missing citation | ||||||||||||
| D | D ← X1 V | 42859 H | ||||||||||
| ↳missing citation | ||||||||||||
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
| C | 42711 | 486 H | 3.5 | C ← X1 V | 42772 H | |||||||
| ↳missing citation | ||||||||||||
| B 2Σ | 32380.3 | 471.7 H | 0.9 | B ← X1 V | 32434.3 H | |||||||
| ↳Oldershaw and Robinson, 1968; missing citation | ||||||||||||
| A 2Σ | 21204.9 | 208.6 H | 1.66 2 | 0.079 | 3 | A ← X1 R | 21127.2 H | |||||
| ↳missing citation | ||||||||||||
| a (4Σ1/2-) | x + 20289.7 | 275.7 H | 5.6 | [(0.118)] 4 | [(2.50)] | a ↔ X2 5 R | 20246.9 H | |||||
| ↳missing citation; missing citation | ||||||||||||
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
| X2 2Π3/2 | x 6 | 359.0 H | 1.1 | |||||||||
| X1 2Π1/2 | 0 | 363.8 H | [(1.25)] 7 | [(2.45)] | ||||||||
Notes
| 1 | Diffuse bands, assignment uncertain. |
| 2 | ωeze = -0.0055. |
| 3 | Only the 7-0 and 8-0 bands of A ← X1 have been analyzed Billingsley, 1972, B' ~ 0.085 Billingsley, 1972. Of the six expected branches only four have been observed; R11 and Q P 21 (i.e. Ree and Pff) lines are absent. Extensive perturbations by levels of a 4Σ1/2- state; see 4. |
| 4 | As a full rotational analysis of the emission bands [called A' → X by Billingsley, 1972 and A → X by Lakshminarayana and Haranath, 1970] was not possible, the nature of the a state is not known. Billingsley, 1972 suggests that this is the same 4Σ1/2- state whose higher vibrational levels (ΔG ~ 176, B ~ 0.097) have been identified in perturbations of A 2Σ(v=7,8). |
| 5 | A much weaker system reported by Lakshminarayana and Haranath, 1970 at 650 cm-1 to the red of the main system was not confirmed by Billingsley, 1972. Transitions to or from X1 2Π1/2 have not been observed. |
| 6 | Billingsley, 1972 assumes x ~ 700 cm-1 Billingsley, 1972. Tentative assignments of weak absorption bands would give x=649 cm-1 Billingsley, 1972 or x=757 cm-1 Oldershaw and Robinson, 1968. |
| 7 | Estimated by assuming the same percentage decrease in bond length from HSiI to SiI as from HSiCl to SiCl Billingsley, 1972. The rotational analysis of the A ← X1 7-0 and 8-0 bands gives B"- |p"|/2 = 0.10987 and D"= 2.1E-7. |
| 8 | Extrapolation of the vibrational levels in A2Σ Billingsley, 1972. An upper limit of 4.02 eV follows from the predissociation in B 2Σ. |
| 9 | The bands become progressively more diffuse with increasing v' Billingsley, 1972. |
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.
Olddershaw and Robinson, 1972
Olddershaw, G.A.; Robinson, K.,
Ultraviolet spectra of GeI and SiI: lower wavelength bands,
J. Mol. Spectrosc., 1972, 44, 602. [all data]
Oldershaw and Robinson, 1968
Oldershaw, G.A.; Robinson, K.,
Ultra-violet absorption spectra of GeI and SiI,
Trans. Faraday Soc., 1968, 64, 2256. [all data]
Billingsley, 1972
Billingsley, J.,
The absorption and emission spectrum of silicon monoiodide,
J. Mol. Spectrosc., 1972, 43, 3, 128-147. [all data]
Lakshminarayana and Haranath, 1970
Lakshminarayana, A.; Haranath, P.B.V.,
The emission band spectrum of silicon monoiodide,
J. Phys. B:, 1970, 3, 4, 576-579. [all data]
Notes
Go To: Top, Constants of diatomic molecules, References
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