  We study the existence of the (thermodynamic) limit of the scaled
cumulant-generating function L_n(z)=|W_n|^{-1}\logE\exp{z|\Xi\cap W_n|} of the
empirical volume fraction |\Xi\cap W_n|/|W_n|, where |\cdot| denotes the
d-dimensional Lebesgue measure. Here \Xi=\bigcup_{i\ge1}(\Xi_i+X_i) denotes a
d-dimensional Poisson grain model (also known as a Boolean model) defined by a
stationary Poisson process \Pi_{\lambda}=\sum_{i\ge1}\delta_{X_i} with
intensity \lambda >0 and a sequence of independent copies \Xi_1,\Xi_2,... of a
random compact set \Xi_0. For an increasing family of compact convex sets {W_n,
n\ge1} which expand unboundedly in all directions, we prove the existence and
analyticity of the limit lim_{n\to\infty}L_n(z) on some disk in the complex
plane whenever E\exp{a|\Xi_0|}<\infty for some a>0. Moreover, closely connected
with this result, we obtain exponential inequalities and the exact asymptotics
for the large deviation probabilities of the empirical volume fraction in the
sense of Cram\'er and Chernoff.
