1. The Discovery of the Interstellar Medium (ISM)
Harry Kroto 2004

2. Hartman 1904 K Ti Fe Ca Na T (100K) Binary Diffuse cloud
Harry Kroto 2004

3. Blue Shifted
Red Shifted
Harry Kroto 2004

4. Blue Shifted
Red Shifted
Harry Kroto 2004

5. Multiple Clouds in the Line of Sight
Harry Kroto 2004

6. Electron Configuration
1s2 2s2 2p63s s2 2s2 2p63p1 Sodium
2P1/2 2P
Spin orbit coupling
2P3/2 nm nm N2 N2 2S
Harry Kroto 2004

7. Doppler Shifts in Interstellar lines
/ = / = v/c
Harry Kroto 2004

8. Doppler Shifts of Interstellar NaD lines
589.00
589.59
(nm)
/ = / = v/c
Harry Kroto 2004

9. Doppler Shifts of Interstellar NaD lines
0.59
589.00
589.59
(nm)
/ = / = v/c
 = (x/x) 0.59
Harry Kroto 2004

10. Doppler Shifts of Interstellar NaD lines
0.59
589.00
589.59
(nm) x
150 mm
/ = / = v/c
 = (x/x) 0.59
Harry Kroto 2004

11. Doppler Shifts of Interstellar NaD lines
0.59
589.00
589.59
(nm) x x
13 mm 
150 mm
/ = / = v/c
 = (x/x) 0.59
Harry Kroto 2004

12. Doppler Shifts of Interstellar NaD lines
0.59
589.00
589.59
(nm) x x
13 mm 
150 mm
/ = / = v/c
 = (x/x) 0.59
= (13/150) = (nm)
Harry Kroto 2004

13. Doppler Shifts of Interstellar NaD lines
0.59
589.00
589.59
(nm) x x
13 mm 
150 mm
/ = / = v/c
 = (x/x) 0.59
= (13/150) = (nm)
v= (0.051/589.0)3x105
Harry Kroto 2004

14. Doppler Shifts of Interstellar NaD lines
0.59
589.00
589.59
(nm) x x
13 mm 
150 mm
/ = / = v/c
 = (x/x) 0.59
= (13/150) = (nm)
v= (0.051/589.0)3x105
= 26 km s-1
Harry Kroto 2004

15. Multiple Clouds in the Line of Sight
Harry Kroto 2004

16. Harry Kroto 2004