title background cosmic ray ionization by suprathermal electrons only
c
c commands controlling continuum =========
c this is hot star continuum
black 30000
intensity  -5. range  0.4412 to 1 Ryd
c this will remove all ionizing radiation
extinguish 24 0
c background CR ionization rate should be 2.5e-17 s^-1,
c Tielens & Hollenbach 1985; McKee AstroPH 9901370
cosmic rays, background
c
c commands for density & abundances =========
abundances ism 
hden 5
c
c commands controlling geometry  =========
set dr 0 
stop zone 5 
stop temperature 400 
c
c other commands for details     =========
set h2 grain formation thermal pump 
atom h2 
iterate
constant temperature 500K
c must turn off line photoexcitation
c since we want to test cr heating and ionization
no induced processes
c
c commands controlling output    =========
normalize to "H2  " 2.121m
print column density 
print ages
save performance "h2_cr_grains.per"
save overview "h2_cr_grains.ovr" last
// default is to save only lines from ground electronic configuration
// electronic all - report all lines
save h2 lines "h2_cr_grains.lin" limit -10 last electronic all 
save continuum units microns "h2_cr_grains.con" last 
save h2 rates "h2_cr_grains.rat" last
save h2 column density "h2_cr_grains.col" last
save grains H2rates "h2_cr_grains.h2r" last
save monitors "h2_cr_grains.asr" last
save dominant rates "h2_cr_grains.h2" "H2" last 
save chemistry rates "h2_cr_grains.h2d" "H2" destruction
c
c commands giving the monitors    =========
// >>chng 05 apr 19, added this test
// >>chng 05 nov 22, from 5.398 to 4.687 stop half thick to avoid grn freeze out
// >>chng 05 dec 17, from 4.69 to 5.39, do not stop due to ices
monitor h2 column 5.39 error 0.1
//
// >>chng 05 jun 07, from 1.87 to 1.72, NA add CO grain condensation
// >>chng 05 aug 03, from 1.72 to 2.02, NA update CO, H chem net
// >>chng 05 nov 22, from 2.02 to -1.13, NA add freeze out onto grains
// >>chng 05 nov 22, from -1.13 to -1.83 stop half thick to avoid grn freeze out
// >>chng 05 dec 17, from -1.83 to -1.13, do not stop due to ices
// >>chng 05 dec 17, from -1.13 to -0.97, NA increase C chemistry
// >>chng 06 jan 12, from -0.97 to 2.01, add term thermal dest ices
// >>chng 11 nov 16, from 2.01 to 1.862, adjust newmole monitors
// >>chng 12 apr 09, from 1.862 to 1.909, update CR backbround to Indriolo+07, ~8x larger
monitor CO column 1.909 error 0.1
//
// >>chng 05 may 07, disable Le Bourlot grain coll orth-para conversion, 
// from 2.776 to 2.995
monitor H2 ortho 2.995
// 
// >>chng 05 aug 03, from 4.33 to 4.29, NA update CO, H chem net
// >>chng 05 nov 22, from 4.29 to 3.59 stop half thick to avoid grn freeze out
// >>chng 05 dec 17, from 3.59 to 4.29, do not stop due to ices
monitor H2 column density level v=0 J=0 N=4.29 error 0.1
// 
// >>chng 05 nov 22, from 5.10 to 4.40 stop half thick to avoid grn freeze out
// >>chng 05 dec 17, from 4.40 to 5.10, do not stop due to ices
monitor H2 column density level v=0 J=1 N=5.10 error 0.1
// 
// >>chng 05 aug 03, from 4.58 to 4.54, NA update CO, H chem net
// >>chng 05 nov 22, from 4.54 to 3.85 NA update freeze out
// >>chng 05 dec 17, from 3.85 to 4.55, do not stop due to ices
monitor H2 column density level v=0 J=2 N=4.55 error 0.1
// 
// >>chng 05 nov 22, from 4.73 to 4.03 NA update freeze out
// >>chng 05 dec 17, from 4.03 to 4.73, do not stop due to ices
monitor H2 column density level v=0 J=3 N=4.73 error 0.1
// 
// >>chng 05 aug 03, from 3.07 to 3.77, NA update CO, H chem net
monitor H2 column density level v=0 J=4 N=3.77 error 0.1
// 
// >>chng 05 aug 03, from 2.84 to 3.54, NA update CO, H chem net
monitor H2 column density level v=0 J=5 N=3.54 error 0.1
//
// >>chng 05 dec 17, add this to confirm got to expected depth and
// did not stop due to ice form
monitor nzone 5 
// 
c h2_cr_grains.in
c class limit  
c ========================================
c 

This tests conditions of cosmic ray ionization and grain formation pumping.
Solomon process is turned off with the "no induced processes" command
so cosmic rays are the main dissociation process.
This forms a pair with h2_cr which does not include grains, so relies
only on gas-phase chemistry.