Low-density laboratory spectra near the He ii λ304 line

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Table A.5

Argon lines observed in EBIT within the wavelength band λ280 to λ320.

Spectrum	Transition type	Line intensity	λ (Å)	Unc. (mÅ)	λ (Å)	λ (Å)
			This work		CHIANTI^a	NIST^b

Known lines
VI	3p−4s	2.7	292.1	100	...	292.134
VI	3p−4s	4.1	294.0	100	...	294.03
IX	3p−4d	0.72	295.9	150	147.9590 (II)	147.952 (II)
IX	3p−4d	...	...	...	148.4120 (II)	148.402 (II)
XII	2s−2p	1.35	299.7	150	149.9290 (II)	149.922 (II)
XI	2s−2p	4.7	303.6	100	151.8540 (II)	151.845 (II)
IX	3p−4d	1.5	...	...	152.5730 (II)	152.576 (II)
IX	3p−4d	blended	...	...	152.6320 (II)	...
IX	3p−4d	blended	...	...	152.6820 (II)	...
IX	3p−4d	1.85	305.6	100	152.6970 (II)	152.690 (II)
XII	2s−2p	1.1	307.2	150	153.6280 (II)	153.624 (II)
IX	3p−4d	...	...	...	153.7060 (II)	153.727 (II)
IX	3p−4d	...	...	...	154.0580 (II)	154.106 (II)
XII	2s−2p	4.2	308.8	100	154.4220 (II)	154.415 (II)
IX	3p−4d	...	...	...	154.4410 (II)	154.454 (II)
IX	3p−4d	...	...	...	155.2620 (II)	155.290 (II)
IX	3p−4d	...	...	...	155.5240 (II)	...
VIII	3s−4p	2.3	317.8	100	158.9210 (II)	158.9211 (II)
XIII	2s−2p	2.4	318.2	100	159.0890 (II)	159.077 (II)
VIII	3s−4p	...	...	...	159.1750 (II)	159.1746 (II)

Unidentified lines
...	...	1.15	280.1	150	...	...
...	...	10	281.9	100	...	...
...	...	1.3	283.5	150	...	...
...	...	3.6	284.2	100	...	...
...	...	0.39	285.6	200	...	...
...	...	0.39	286.3	200	...	...
...	...	0.45	290.4	200	...	...
...	...	0.55	292.5	200	...	...
...	...	0.56	295.1	200	...	...
...	...	1.9	297.6	100	...	...
...	...	2.6	298.8	100	...	...
...	...	3.4	300.1	100	...	...
...	...	0.55	300.9	200	...	...
...	...	0.46	301.4	200	...	...
...	...	1.1	303.0	150	...	...
...	...	0.38	304.9	200	...	...
...	...	0.4	310.0	100	...	...
...	...	0.2	310.9	200	...	...
...	...	0.1	314.5	200	...	...

Notes. The unknown Ar lines may technically originate in spectra up to Ar ix.

Reference.

^(a)

From the CHIANTI database v.8 (Del Zanna et al. 2015);

^(b)

from the on-line database at NIST (Kramida et al. 2012).

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