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First Measurements of Bond Lengths

Of course, the identification of a new molecule is distinctly different than providing useful information about that molecule. Below is a list of some of the useful information we have provided for the first time. I have chosen to list just two parameters, the ground state bond length and the ground state symmetry. These bond lengths may be given as r0 (corresponding to the average bond length in the v=0 vibrational level) or re (corresponding to the bond length at the minimum of the potential energy curve, obtained by extrapolating the average bond lengths of a series of vibrational levels back to the minimum of the potential curve). Here is a list of the bond lengths first measured in my group:

Coinage Group Dimers: 
  Transition Metal Aluminides: 
r0(CuAg, X 1Σ+) = 2.3735(6) Å   r0(AlCa, X2Π ) = 3.1479(10) Å
r0(CuAu, X 1Σ+) = 2.3302(6) Å   r0(AlV, X0) = 2.620(4) Å
    r0(AlMn, X 5Π ) = 2.6384(10) Å
Nickel Group Dimers:    r0(AlCo, X 3Δ3) = 2.3833(5) Å
r0(Ni2, X0g+ or X0u-) = 2.1545(4) Å   r0(AlNi, X 2Δ5/2) = 2.3211(7) Å
r0(NiPd, X2) = 2.242(5) Å   r0(AlCu, X 1Σ+) = 2.3389(4) Å
r0(NiPt, X0) = 2.208(2) Å   r0(AlZn, X 2Π ) = 2.6957(4) Å
r0(Pt2, X0g+ or X0u-) = 2.3329(4) Å   r0(AlY, X 3Σ0-) = 2.8728(12) Å
     
Mixed Nickel-Coinage Group Dimers:    Transition Metal Oxide: 
r0(NiAu, X2Δ5/2) = 2.351(1) Å   r0(MoO, X 5Π ) = 1.70 Å
r0(PtCu, X2Δ5/2) = 2.3353(8) Å    
r0(NiCu, X2Δ5/2) = 2.2346(5) Å   Linear Triatomic Molecule: 
    r0(Si-N-Si, X 2Π1/2,g) = 1.6395(14) Å
Other Transition Metal Dimers:     
re(CrMo, X 1Σ+) = 1.8182(15) Å   Transition Metal Carbides: 
re(V2, X 3Σg-(0g+)) = 1.77   r0(VC, X 2Δ3/2) = 1.6167(3) Å
r0(Ti2, X 3Δ1g) = 1.9422(8) Å   r0(CrC, X 3Σ-) = 1.6188(6) Å
re(YCu, X 1Σ+) = 2.6197(6) Å   r0(NiC, X 1Σ+) = 1.63084(10) Å
r0(VCr, X 2Δ5/2) = 1.7260(11) Å   r0(MoC, X 3Σ-) = 1.68711(19) Å
r0(NbCr, X 2Δ5/2) = 1.8940(3) Å   r0(RuC, X 1Σ+) = 1.6081(1) Å
r0(VMo, X 2Δ5/2) = 1.8766(2) Å   r0(PdC, X 1Σ+) = 1.7124(8) Å
r0(NbMo, X 2Δ5/2) = 2.0081(3) Å   r0(TaC, X 2Σ+) = 1.7490(2) Å
r0(TiCo, X 2Σ+) = 1.8508(4) Å   r0(WC, X 3Δ1) = 1.7143(2) Å
r0(ZrCo, X 2Σ+) = 1.9883(4) Å   r0(OsC, X 3Δ3) = 1.67267(5) Å
r0(CrW, X 1Σ+) = 1.8814(4) Å    
r0(ZrFe, X 1Σ+) = 1.8768(2) Å   Transition Metal Silicides: 
r0(TiFe, X 1Σ+) = 1.7024(3) Å   r0(NiSi, X 1Σ+) = 2.032(3) Å 
r0(ScCo, X 1Σ+) = 1.8121(10) Å   r0(RuSi, X 3Δ3) = 2.0921(4) Å
r0(YCo, X 1Σ+) =  1.9830(8) Å   r0(PdSi, X 1Σ+) = 2.0824(3) Å 
    re(OsSi, X 3Σ-(0+)) = 2.1201(27) Å
Main Group Dimers:   r0(IrSi, X 2Δ5/2) = 2.0899(1) Å
r0(GaAs, X 3Σg-) = 2.53(2) Å   r0(PtSi, X 1Σ+) = 2.0629(2) Å
re(Al2, X 3Πu) = 2.701(2) Å    
    Actinide Nitride:
    r0(UN, X3.5) = 1.7650(12) Å
Last Updated: 6/7/19