Magnesium iodide

Formula: IMg
Molecular weight: 151.2095
CAS Registry Number: 14332-62-8
Information on this page:
Other data available:
- Gas phase thermochemistry data
- Gas phase ion energetics data
Options:
- Switch to SI units

Constants of diatomic molecules

Data compiled by: Klaus P. Huber and Gerhard H. Herzberg

Data collected through March, 1977

Symbols used in the table of constants
Symbol	Meaning
State	electronic state and / or symmetry symbol
T_e	minimum electronic energy (cm^-1)
ω_e	vibrational constant – first term (cm^-1)
ω_ex_e	vibrational constant – second term (cm^-1)
ω_ey_e	vibrational constant – third term (cm^-1)
B_e	rotational constant in equilibrium position (cm^-1)
α_e	rotational constant – first term (cm^-1)
γ_e	rotation-vibration interaction constant (cm^-1)
D_e	centrifugal distortion constant (cm^-1)
β_e	rotational constant – first term, centrifugal force (cm^-1)
r_e	internuclear distance (Å)
Trans.	observed transition(s) corresponding to electronic state
ν₀₀	position of 0-0 band (units noted in table)

Diatomic constants for ⁽²⁴⁾Mg¹²⁷I
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
D	26680	295 H	0.5								D → X	26670 H
D	↳Puri and Mohan, 1975
C	26099	270 H	0.72								C → X	26076 H
C	↳Puri and Mohan, 1975
B	25612	295 H									B ↔ X R	25602 H
B	↳Morgan, 1936; Puri and Mohan, 1975
A	24319	323 H	1.0								A ↔ X V	24322 H
A	↳Morgan, 1936; Puri and Mohan, 1975
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
X (²Σ)	0	316 H	0.50

Notes

From an ill-defined threshold for dissociation photoionization, and from the heat of atomization of MgI₂; using an assumed value for the ionization potential of MgI Berkowitz and Chupka, 1966.

References

Go To: Top, Constants of diatomic molecules, Notes

Puri and Mohan, 1975
Puri, S.N.; Mohan, H., Thermal emission spectrum of MgI, Pramana, 1975, 4, 171. [all data]

Morgan, 1936
Morgan, F., Band spectra of MgCl, MgBr and MgI in absorption, Phys. Rev., 1936, 50, 603. [all data]

Berkowitz and Chupka, 1966
Berkowitz, J.; Chupka, W.A., Photoionization of high-temperature vapors. I. The iodides of sodium, magnesium, and thallium, J. Chem. Phys., 1966, 45, 1287. [all data]

Notes

Go To: Top, Constants of diatomic molecules, References

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
Customer support for NIST Standard Reference Data products.