Lead hydride

Formula: HPb
Molecular weight: 208.2
CAS Registry Number: 14452-81-4
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Constants of diatomic molecules

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

Data collected through May, 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 ⁽²⁰⁸⁾PbH
State	T_e	ω_e	ω_ex_e	B_e	α_e	D_e	r_e	Trans.	ν₀₀
C (²Δ) 1								C → X	26205
C (²Δ) 1	↳Watson and Simon, 1940; Kleman, 1953
B	(18030) 2	[478.8] 3 Z		[2.478] 3 4			[2.604]	B → X R	17498.7 3 Z
B	↳Watson, 1938; Watson and Simon, 1940
A	(17590)	(500) 5	(10) 5	(3.02₅) 5	(0.05) 5		(2.36)	(A-X)	(17060) 5
X (²Π_1/2)	0 6	1564.1 Z	29.75	4.971	0.144	[201E-6]	1.838₈

Notes

Single weak band, not yet analyzed.

Watson, 1938, Watson and Simon, 1940 assumed this to be a ²Σ state; more recently, Kleman, 1953 suggested that the red system of PbH originates from a ⁴Σ^-(1/2,3/2) upper state.

Strong perturbations; ΔG(3/2)= 448.1, ΔG(5/2)= 438.5, ΔG(7/2)= 432.6, ΔG(9/2)= 403: B₁= 2.660, B₂= 2.766, B₃= 2.770, B₄= 2.646 for low J values. Gero, 1940 has estimated the following "deperturbed" constants: ω_e = 535 Gero, 1940, ω_ex_e = 15 Gero, 1940; B_e = 2.48 Gero, 1940, α_e = 0.08 Gero, 1940, T₀ = 17520 Gero, 1940.

Breaking off (predissociation) at N'=30,24,20 for v'=3,4,5, respectively Watson, 1938. The v=5, N=20 level lies at about 20610 cm^-1 above the lowest ground state level.

All constants estimated from the perturbations in B Gero, 1940.

Originally believed to be ²Σ Watson, 1938, Watson and Simon, 1940, reassigned by Howell, 1945, Kleman, 1953. The ²Π_3/2 component is expected at ~8000 cm^-1 above ²Π_1/2; the corresponding spectrum is in the infrared and not yet observed.

From the predissociation in B assuming dissociation at that limit into ³P₁ + ²S.

References

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Watson and Simon, 1940
Watson, W.W.; Simon, R., Spectra of lead hydride and tin hydride in the near infra-red, Phys. Rev., 1940, 57, 708. [all data]

Kleman, 1953
Kleman, Thesis, Stockholm, 1953, 1. [all data]

Watson, 1938
Watson, W.W., The spectrum of lead hydride, Phys. Rev., 1938, 54, 1068. [all data]

Gero, 1940
Gero, L., Zur vervollstandigung des termschemas von bleihydrid, Z. Phys., 1940, 116, 379. [all data]

Howell, 1945
Howell, H.G., The spectra of tin and lead hydrides, Proc. Phys. Soc. London, 1945, 57, 37. [all data]

Notes

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Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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