Fitting to an exponential function from row datas

I have a function y dependent on t. I want to fit it to a function of y=a*exp(-b/t) and determine the variables "a" and "b". I write the code below, however, it didn't converge. Any help is appreciated.

Thanks GH

clear all
clc

Data=[300.0092  2.2742e-16
331.0053  2.1617e-15
335.0210  3.0675e-15
361.2484  4.3307e-14]; 

t = Data(:,1);
y = Data(:,2);

plot(t,y,'ro')
title('Data points')

F = @(x,xdata)x(1)*exp(-x(2)*xdata);

x0 = [10^-16 0.001];

[x,resnorm,~,exitflag,output] = lsqcurvefit(F,x0,t,y)

hold on
plot(t,F(x,t))
hold off

Answer 1

[Star Strider]

It appears to with:

x0 = [1E-15 -0.1];