"rich spectrum" is a correct and usable phrase in written English.
It is often used to describe something that has a wide variety or range of characteristics or qualities. Example: "The city's culture is reflected in its rich spectrum of food, music, and art."
She loved all the arts and embodied an extraordinarily rich spectrum of cultural appreciation and scholarship.
From May 2014 to March 2015 the theatre is running '=dance', a programme that explores the increasingly rich spectrum of dance created by deaf and disabled artists.
Hyper-masculine or sexualized feminine gestures and poses bled into lunging, buckling skeins of choreography that brought to mind a rich spectrum of contemporary dance, from Ronald K. Brown to Trisha Brown.
The dynamics of planetary gears show a rich spectrum of nonlinear phenomena.
Leeches are fascinating creatures: they have simple modular nervous circuitry yet exhibit a rich spectrum of behavioural modes.
Principal component analysis reveals a rich spectrum of hinge bending, rocking, twisting, and sweeping motions that are different for the GluN1, GluN2A, GluN3A, and GluA2 LBDs.
Most daunting, however, was its inability to explain the rich spectra of multielectron atoms.
The particular combination of biofunctionality and amphiphilicity inherent to SLPs confers on them a rich spectra of applications in the field of biomaterials.
Still, he cautioned: "Harmonies that sound really good on the piano can be not so good on the marimba, which has a richer spectrum.
eCMAM30 still presents a richer spectrum than SABER.
We observe that pertinent aspects of neutron physics and modern technology together offer a far richer spectrum of possibilities for nuclear power reactors than has been significantly explored through the present; the present architecture is merely exemplary.
