Fourier transform ion cyclotron resonance studies of H2 chemisorption on niobium cluster cations

Reaction rates and saturation values were determined for H2 dissociative chemisorption on positive niobium cluster ions in an FT‐ICR apparatus. Clusters with 8,10,12, and 16 atoms were found to be particularly unreactive, in remarkable agreement with the reactivity patterns observed previously for neutral niobium clusters. Saturation coverage for most clusters was found to occur near a hydrogen/niobium ratio of 1.3, although some clusters (8–12,16, and 19) reached effectively inert compositions at considerably lower coverages. Several examples were found of clusters having two isomeric forms with different reactivities. One form of Nb+19 was found to readily react with H2, whereas a second form representing one‐third of the original sample of 19 atom clusters was completely inert to H2 chemisorption under the same FT‐ICR conditions. The geometrical shape of these niobium clusters must therefore have a critical effect on reactivity.

[1]  R. Levine.  Molecular reaction dynamics , 2005 .

[2]  R. Dunbar.  Time-resolved photodissociation of chlorobenzene ion in the ICR spectrometer , 1987 .

[3]  M. R. Zakin,et al.  Effect of hydrogen chemisorption on the photoionization threshold of isolated transition metal clusters , 1987 .

[4]  A. Marshall,et al.  Phase-modulated stored waveform inverse Fourier transform excitation for trapped ion mass spectrometry. , 1987, Analytical chemistry.

[5]  R. Smalley,et al.  Photodetachment and photofragmentation studies of semiconductor cluster anions , 1986 .

[6]  Richard E. Smalley,et al.  Charge dependence of chemisorption patterns for transition metal clusters , 1986 .

[7]  R. Smalley,et al.  Metal cluster ion cyclotron resonance. Combining supersonic metal cluster beam technology with FT-ICR , 1986 .

[8]  R. Smalley,et al.  Dissociative chemisorption of molecular hydrogen on niobium cluster ions. A supersonic cluster beam FT-ICR experiment , 1986 .

[9]  Donald M. Cox,et al.  Electron binding and chemical inertness of specific Nbx clusters , 1986 .

[10]  W. Heer,et al.  Shell structure and response properties of metal clusters , 1986 .

[11]  S. C. O'brien,et al.  Supersonic cluster beams of III–V semiconductors: GaxAsy , 1986 .

[12]  Lowell S. Brown,et al.  Geonium theory: Physics of a single electron or ion in a Penning trap , 1986 .

[13]  R. Smalley,et al.  Formation and photodetachment of cold metal cluster negative ions , 1985 .

[14]  E. K. Parks,et al.  Reactions of iron clusters with hydrogen. III. Laser‐induced desorption of H2 by multiphoton absorption , 1985 .

[15]  R. Smalley,et al.  Surface reactions of metal clusters. II. Reactivity surveys with D2, N2, and CO , 1985 .

[16]  Stephen J. Riley,et al.  Reactions of iron clusters with hydrogen. II. Composition of the fully hydrogenated products , 1985 .

[17]  Michael D. Morse,et al.  Hydrogen chemisorption on transition metal clusters , 1985 .

[18]  W. Thomas,et al.  High-resolution TOF mass spectrometry. II. Experimental confirmation of impulse-field focusing theory , 1981 .

[19]  M. Bowers.  Gas phase ion chemistry , 1979 .

[20]  H. Wenzl,et al.  The systems NbH(D), TaH(D), VH(D) : Structures, phase diagrams, morphologies, methods of preparation , 1978 .

[21]  E. Donaldson,et al.  Interaction of hydrogen with a (100) niobium surface , 1974 .