Context : We present observations of rotational lines of H _ { 2 } S , SO and CS performed in comet C/1995 O1 ( Hale-Bopp ) in March 1997 with the Plateau de Bure interferometer of Institut de Radioastronomie Millimétrique ( IRAM ) .

Aims : The observations provide informations on the spatial and velocity distributions of these molecules .
They can be used to constrain their photodissociation rate and their origin in the coma , i.e .
nucleus or parent source .

Methods : We use a radiative transfer code which allows us to compute synthetic line profiles and interferometric maps , to be compared to the observations .

Results : Both single-dish spectra and interferometric spectral maps show evidence for a day/night asymmetry in the outgassing .
From the analysis of the spectral maps , including the astrometry , we show that SO and CS present in addition a jet-like structure that may be the gaseous counterpart of the dust high-latitude jet observed in optical images .
A CS rotating jet is also observed .
Using the astrometry provided by continuum radio maps obtained in parallel at IRAM , we conclude that there is no need to invoke the existence of nongravitational forces acting on this comet , and provide an updated orbit .
The radial extension of H _ { 2 } S is found to be consistent with direct release of H _ { 2 } S from the nucleus .
SO displays an extended radial distribution .
Assuming that SO _ { 2 } is the parent of SO , the photodissociation rate of SO is measured to be 1.5 \times 10 ^ { -4 } \mathrm { s } ^ { -1 } at 1 AU from the Sun .
This is lower than most laboratory-based estimates and may suggest that SO is not solely produced by SO _ { 2 } photolysis .
From the observations of J ( 2–1 ) and J ( 5–4 ) CS lines , we deduce a CS photodissociation rate of 1 - 5 \times 10 ^ { -5 } \mathrm { s } ^ { -1 } .
The photodissociation rate of CS _ { 2 } , the likely parent of CS , can not be constrained due to insufficient angular resolution , but our data are consistent with published values .

Conclusions : These observations illustrate the cometary science that will be performed with the future ALMA interferometer .