  High quality vibrational spectra of solid-phase molecules in ice mixtures and
for temperatures of astrophysical relevance are needed to interpret infrared
observations toward protostars and background stars. Over the last 25 years,
the Laboratory for Astrophysics at Leiden Observatory has provided more than
1100 spectra of diverse ice samples. Timely with the recent launch of the James
Webb Space Telescope, we have fully upgraded the Leiden Ice Database for
Astrochemistry (LIDA) adding recently measured spectra. The goal of this
manuscript is to describe what options exist to get access to and work with a
large collection of IR spectra, and the UV/vis to mid-infrared refractive index
of H2O ice and astronomy-oriented online tools to support the interpretation of
IR ice observations. LIDA uses Flask and Bokeh for generating the web pages and
graph visualization, respectively, SQL for searching ice analogues within the
database and Jmol for 3D molecule visualization. The infrared data in the
database are recorded via transmission spectroscopy of ice films condensed on
cryogenic substrates. The real UV/vis refractive indices of H2O ice are derived
from interference fringes created from the simultaneous use of a monochromatic
HeNe laser beam and a broadband Xe-arc lamp, whereas the real and imaginary
mid-IR values are theoretically calculated. LIDA also offers online tools. The
first tool, SPECFY, used to create a synthetic spectrum of ices towards
protostars. The second tool aims at the calculation of mid-infrared refractive
index values. LIDA allows to search, download and visualize experimental data
of astrophysically relevant molecules in the solid phase, as well as to provide
the means to support astronomical observations. As an example, we analyse the
spectrum of the protostar AFGL 989 using the resources available in LIDA and
derive the column densities of H2O, CO and CO2 ices.
