Wavelength effects in the ultraviolet‐laser ablation of polycarbonate and poly(α‐methylstyrene) examined by time‐of‐flight mass spectroscopy

1990 ◽  
Vol 68 (4) ◽  
pp. 1878-1882 ◽  
Author(s):  
S. G. Hansen
Keyword(s):  
Laser Ablation ◽  
Mass Spectroscopy ◽  
Time Of Flight ◽  
Ultraviolet Laser

Silicon Subiodide Clusters

2007 ◽  
Vol 7 (11) ◽  
pp. 3788-3791 ◽  
Author(s):  
Andriy Dmytruk ◽  
Yeon-Su Park ◽  
Atsuo Kasuya ◽  
Hideki Kikuchi ◽  
Masae Takahashi ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Ab Initio ◽  
Mass Spectroscopy ◽  
Theoretical Calculations ◽  
Time Of Flight ◽  
Experimental Results ◽  
Silicon Cluster ◽  
Chain Ring ◽  
Bulk Powder

Silicon subiodide clusters (SinIm, n = 1–20) produced by laser ablation of bulk powder silicone tetraiodide have been investigated by time-of-flight mass spectroscopy and ab initio calculations. Both experimental results and theoretical calculations revealed a tendency to form different structures of the clusters depending on n: chain, ring, and cage structures for n ≤ 6, 6 < n < 16, and n ≥ 16, respectively. The results showed that iodine, like hydrogen, can be used for stable silicon cluster termination.

Silicon Subiodide Clusters

2007 ◽  
Vol 7 (11) ◽  
pp. 3788-3791
Author(s):  
Andriy Dmytruk ◽  
Yeon-Su Park ◽  
Atsuo Kasuya ◽  
Hideki Kikuchi ◽  
Masae Takahashi ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Ab Initio ◽  
Mass Spectroscopy ◽  
Theoretical Calculations ◽  
Time Of Flight ◽  
Experimental Results ◽  
Silicon Cluster ◽  
Chain Ring ◽  
Bulk Powder

Silicon subiodide clusters (SinIm, n = 1–20) produced by laser ablation of bulk powder silicone tetraiodide have been investigated by time-of-flight mass spectroscopy and ab initio calculations. Both experimental results and theoretical calculations revealed a tendency to form different structures of the clusters depending on n: chain, ring, and cage structures for n ≤ 6, 6 < n < 16, and n ≥ 16, respectively. The results showed that iodine, like hydrogen, can be used for stable silicon cluster termination.

scholarly journals Laser Ablation Studies of Deposited Silver Colloids Active in SERS

2002 ◽  
Vol 20 (1) ◽  
pp. 23-32 ◽  
Author(s):  
R. Torres La Porte ◽  
D. Silva Moreno ◽  
M. Castillejo Striano ◽  
M. Martiín Munñoz ◽  
J. V. García-Ramos ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Temporal Resolution ◽  
Mass Spectroscopy ◽  
Mass Spectra ◽  
Time Of Flight ◽  
Laser Wavelength ◽  
Ablation Plume ◽  
Expansion Velocity ◽  
Silver Colloids ◽  
532 Nm

Laser ablation of deposited silver colloids, active in SERS, is carried out at three different laser wavelengths (KrF, XeCl and Nd:YAG at λ = 248, 308 and 532 nm respectively). Emission form excited neutral Ag and Na atoms, present in the ablation plume, is detected with spectral and temporal resolution. The expansion velocity of Ag in the plume is estimated in ~1×104m s−1. Low-fluence laser ablation of the colloids yields ionized species that are analyzed by time-of-flight mass spectroscopy. Na+ and Agn+(n≤3) are observed. Composition of the mass spectra and widths of the mass peaks are found to be dependent on laser wavelength, suggesting that the dominant ablation mechanisms are different at the different wavelenghts.

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