Samples of polymethylmethacrylate have been irradiated with laser pulses of 266 nm wavelength along with the wavelengths generated via hydrogen‐shifted stimulated Raman scattering. A quadrupole mass spectrometer monitors in real time the photoablation products produced during the irradiation. At wavelengths of 266 nm and above, the products are dominated by monomer, CO2, and CO. At wavelengths below 266 nm, a dramatic change of ablation products is observed, with methyl formate appearing as a major photochemical product.
REFERENCES
1.
J. E.
Andrew
, P. E.
Dyer
, D.
Forster
, and P. H.
Key
, Appl. Phys. Lett.
43
, 717
(1983
).2.
3.
4.
5.
6.
G. M.
Davis
, M. C.
Gower
, C.
Fotakis
, T.
Efthimiopoulos
, and P.
Argyrakis
, Appl. Phys. A
36
, 27
(1985
).7.
B.
Danielzik
, N.
Fabricius
, M.
Rowekamp
, and D.
von der Linde
, Appl. Phys. Lett.
48
, 212
(1986
).8.
R.
Srinivasan
, B.
Braren
, D. E.
Seeger
, and R. W.
Dreyfus
, Macromolecules
19
, 916
(1986
).9.
R.
Srinivasan
, B.
Braren
, R. W.
Dreyfus
, L.
Hadel
, and D. E.
Seeger
, J. Opt. Soc. Am. B
3
, 785
(1986
).10.
11.
See for example, EPA/NIH Mass Spectral Data Base, US Department of Commerce, 1978.
12.
13.
K. Tsuji, Advances in Polymer Science (Springer, New York, 1973), Vol. 12, p. 131.
14.
N. J. Turro, Modern Molecular Photochemistry (Benjamin/Cummings, Reading, Massachusetts, 1978).
15.
W. Schnabel, Polymer Degradation (MacMillan, New York, 1981).
16.
Signals generated at this later ablation power level are barely above those due to background gas.
17.
B.
Danielzik
, N.
Fabricins
, M.
Rowekamp
, and D.
von der Linde
, Appl. Phys. Lett.
48
, 212
(1986
).18.
19.
H. H. G.
Tellinek
and R.
Srinivasan
, J. Phys. Chem.
88
, 3048
(1984
).20.
This content is only available via PDF.
© 1986 American Institute of Physics.
1986
American Institute of Physics
You do not currently have access to this content.
