Silver monohydride

Formula: AgH
Molecular weight: 108.8761
CAS Registry Number: 13967-01-6
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Constants of diatomic molecules

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

Data collected through October, 1974

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 ¹⁰⁷AgH
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
c₀ (³Π₀)					[5.10] 1			[0.00060]		[1.82₀]	c₀ ← X R	46981.1 Z
c₀ (³Π₀)	↳missing citation
d ³Σ⁺					[(3.83)] 2					[(2.10₀)]		(46875) 3
d ³Σ⁺	↳missing citation
c₁ ³Π₁					[(4.95)] 4			[(0.00060)]		[(1.84₇)]	c₁ ← X R	(46600) 4
c₁ ³Π₁	↳missing citation
D ¹Π	(46720)	[844.7] Z	(120)		5.23 5	0.58		0.00060		1.79₇	D ← X R	46360.9 Z
D ¹Π	↳missing citation
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
b (³Δ₁) 1					[4.805] 6			[0.00035]		[1.874₅]	b ← X 7 R	44529.2 Z
b (³Δ₁) 1	↳missing citation
B ¹Σ⁺	(44512)	[1089] 8	(65)		(4.87) 8	(0.31)		(0.00038)		(1.86₂)	B ← X R	(44234) 8
B ¹Σ⁺	↳missing citation
a ³Π_r	(41700) 9	(1450)	(50)		(>6.3) 9					(<1.64)
a ³Π_r	↳missing citation
C ¹Π	(41261)	(1589) 10	(42) 10		[6.54]	(0.31) 10		[0.00049]		[1.60₇]	C ← X	41173.6 Z
C ¹Π	↳missing citation
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
A ¹Σ⁺	29959	[1489.6] Z	87.0 11		[6.090₅]	0.3485 11		[0.00038₉]		[1.6650]	A ← X R	29897.9₄ Z
A ¹Σ⁺	↳Bengtsson and Olsson, 1931; missing citation; Gero and Schmid, 1943; Learner, 1962; Loginov, 1964
X ¹Σ⁺	0	1759.9 Z	34.06 12		6.449 13	0.201 12		[0.000344] 14		[1.618₁]

Notes

Strong perturbations. Constants valid near J=0 only.

From perturbations in c₁(v=0).

Estimated energy of v'=0,N'=0 relative to X ¹Σ (v=0,N=0).

The only observed level is strongly perturbed by more than one state. Constants refer to unperturbed region around J=l9. Origin of 0-0 band (not observed) at 46692 cm^-1.

Perturbations in v=0,1; bands going to v'=0 of AgD have not been analyzed. Constants refer to unperturbed regions near J=0. Large Λ-type doubling. AgH: Δν_ef(v=0) = 0.244J(J+1)-... AgD: Δν_ef(v=1) = +0.077₂J(J+1).

Constants refer to unperturbed region near J=O. Large Ω-type doubling; AgH: Δν_ef = 0.156J(J+1)-... AgD: Δν_ef = 0.033₇J(J+1)+ ...

P branch very weak or absent.

Approximate constants for the deperturbed state. Origins of the 0-0 bands at 44225.0 cm^-1 (AgH) and 44277.4 cm^-1 (AgD). v=1 is free of perturbations. AgH; B₁=4.4l2, D₁=3.5E-4, ν₀(1-0)=45322.8 cm^-1; AgD; B₁=2.343, D₁=0.95E-4, ν₀(1-0)=45097.8 cm^-1.

Constants estimated from perturbations in C ¹Π , B ¹Σ⁺, D ¹Π of AgH, and b 1 of AgD; vibrational numbering uncertain. +150 ≤ A ≤ +200.

Approximate constants for the deperturbed state. Perturbations in v=0,1,2 are caused by a ³Π. AgH: ΔG(1/2)= 1519, ΔG(3/2)= 1453; AgD: ΔG(1/2)= 1056, ΔG(3/2)= 987.

Anomalous potential curve; see Learner, 1962. Constants for higher vibrational levels of AgH in Bengtsson and Olsson, 1931, Bengtsson-Knave, 1932. The constants for AgD are valid for v ≤ 4.

Higher order terms are needed to represent levels with v ≥ 4; see Bengtsson and Olsson, 1931, Bengtsson-Knave, 1932, Gero and Schmid, 1943.

RKRV potential curve Singh and Rai, 1965.

H₀= +88E-10(AgH); H₀= +6E-10 (AgD).

Graphical Birge-Sponer extrapolation of X ¹Σ⁺. Thermochemical value 2.4₉ eV Farkas, 1929.

From the value for AgH.

Constants refer to unperturbed regions near J=0. Small Λ-type doubling.

R,P much weaker than Q branches.

Approximate constants for the deperturbed state. v=0 strongly perturbed by more than one state. Origin of 0-0 band (not observed) at 46794 cm^-1.

References

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Bengtsson and Olsson, 1931
Bengtsson, E.; Olsson, E., Eine neue untersuchung uber die banden des silberhydrids, Z. Phys., 1931, 72, 163. [all data]

Gero and Schmid, 1943
Gero, L.; Schmid, R., Uber das bandenspektrum des silberhydrids, Z. Phys., 1943, 121, 459. [all data]

Learner, 1962
Learner, R.C.M., The influence of vibration-rotation interaction on intensities in the electronic spectra of diatomic molecules. II. The silver hydride molecule, Proc. R. Soc. London A, 1962, 269, 327. [all data]

Loginov, 1964
Loginov, V.A., The production of electronic band spectra by the exploding wire method, Opt. Spectrosc. Engl. Transl., 1964, 16, 220, In original 402. [all data]

Bengtsson-Knave, 1932
Bengtsson-Knave, E., Uber die bandenspektren einiger metallhydride, Nova Acta Regiae Soc. Sci. Ups., 1932, 8, 4, 1-98. [all data]

Singh and Rai, 1965
Singh, R.B.; Rai, D.K., On the potential energy curves of AgH, AgCl, and AgI, Can. J. Phys., 1965, 43, 1685. [all data]

Farkas, 1929
Farkas, A., Uber die bildung von gasformigen goldhydrid, Z. Phys. Chem. Abt. B, 1929, 5, 467. [all data]

Notes

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Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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