  Spectrum syntheses for three elements (Mg, Na, and Eu) in high-resolution
integrated light spectra of the Galactic globular clusters 47 Tuc, M3, M13, NGC
7006, and M15 are presented, along with calibration syntheses of the Solar and
Arcturus spectra. Iron abundances in the target clusters are also derived from
integrated light equivalent width analyses. Line profiles in the spectra of
these five globular clusters are well fit after careful consideration of the
atomic and molecular spectral features, providing levels of precision that are
better than equivalent width analyses of the same integrated light spectra, and
that are comparable to the precision in individual stellar analyses. The
integrated light abundances from the 5528 and 5711 A Mg I lines, the 6154 and
6160 A Na I lines, and the 6645 A Eu II line fall within the observed ranges
from individual stars; however, these integrated light abundances do not always
agree with the average literature abundances. Tests with the second parameter
clusters M3, M13, and NGC 7006 show that assuming an incorrect horizontal
branch morphology is likely to have only a small (< 0.06 dex) effect on these
Mg, Na, and Eu abundances. These tests therefore show that integrated light
spectrum syntheses can be applied to unresolved globular clusters over a wide
range of metallicities and horizontal branch morphologies. Such high precision
in integrated light spectrum syntheses is valuable for interpreting the
chemical abundances of globular cluster systems around other galaxies.
