Spatially Resolved Core Level Spectroscopy of Nanotubes

Abstract:

In core-level electron energy loss spectroscopy (EELS) for anisotropic systems, the applied electric field is determined by the momentum transfer vector q, therefore the collection solid angle range for the scattering electrons and sample orientation will affect the measured EELS spectra.. Using the spatially resolved C 1s core excitation in carbon nanotube as an example, we show that the EELS measurement can be understood by a simple dipole theory of anisotropic core loss spectroscopy which decomposes the spectral contribution in terms of orientationelly averaged isotropic spectrum and linear dichrotic spectrum. In addition, we point out the Magic Angle (MA) conditions that allow the direct determination of the averaged spectra acquired independent of the exact sample orientation.

• Periodical: Materials Science Forum (Volumes 475-479)
• Pages: 4085-4088
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.475-479.4085
• Online since: January 2005
• Authors: Yue Kui Sun, Jun Yuan
• Keywords: Anisotropy, EELS, Electronic Structure, Magic Angle, Nanotube

References

[1] Leapman, R.D. and J. Silcox, Physical Review Letters, 1979. 42: p.1361.

[2] Lee, Y.S., et al., Materials Transactions Jim, 2000. 41(5): p.555.

[3] Lubbe, M., et al., Journal of Applied Physics, 1999. 86(1): p.209.

[4] Fink, J., et al., J. Electron Spectrosc. Rel. Phenom., 1994. 66: p.395.

[5] Klie, R.F., et al., Physical Review B, 2003. 67(14): p.144508.

[6] Egerton, R.F.: Electron Energy Loss Spectroscopy in the Electron Microscope. 1996, New York: Plenum Press.

[7] Sun, Y.K. and J. Yuan, http: /arxiv. org/abs/cond-mat/0405105, (2004).

[8] Browning, N.D., J. Yuan, and L.M. Brown, Ultramicroscopy, 1991. 38: p.291.

[9] Browning, N.D., J. Yuan, and L.M. Brown, Philos. Mag. A, 1993. 67: p.261.

[10] Menon, N.K. and J. Yuan, Ultramicroscopy, 1998. 74(1-2): p.83.

[11] Leapman, R.D., P.L. Fejes, and J. Silcox, Physical Review B, 1983. 28: p.2361.